How to propagate Grevillea banksii by seed? These key points you need to master
Grevillea banksii, also known as Banks' grevillea, is an evergreen small tree. Its flowers are large and red, with a long blooming period that can last up to 250 days in its place of origin. More and more gardening enthusiasts are now growing Grevillea banksii as potted plants in their courtyards, where they look very beautiful
Grevillea banksii, also known as Banks' grevillea, is an evergreen small tree. Its flowers are large and red, with a long blooming period that can last up to 250 days in its place of origin. More and more gardening enthusiasts are now growing Grevillea banksii as potted plants in their courtyards, where they look very beautiful.
Grevillea banksii
When growing Grevillea banksii as a small indoor potted plant, you can first sow the seeds in a seedling tray, and after germination, transplant the seedlings with similar growth rates into 3 to 5 inch pots, so they will grow more evenly. Be careful not to damage the roots when transplanting. Generally, a 3-inch pot is best planted with more than five seedlings for more luxuriant growth. For the pot, you can choose a rustic clay pot or an ornate blue-and-white porcelain pot, both of which beautifully complement the delicate leaves of the grevillea. Finally, place it on a windowsill or in a spot with ample indoor light. Because the seedlings are restricted by the pot, they will not grow too large and can be maintained for a very long time. However, if the growing location has insufficient light, the seedlings will easily become leggy, which affects their appearance.
Key management points for courtyard flowers in September
In September, temperatures in most parts of China gradually decline, with the monthly average temperature between 20°C and 24°C. This month is suitable for a wide variety of potted ornamental plants displayed in courtyards.Among them, the woody ornamental plant species include: Norfolk Island pine, five-needle pine, golden larch, Japanese umbrella pine, lacebark pine, Japanese fir, Buddhist pine, podocarpus, sago palm, Canary Island date palm, Australian tree fern, Fagraea fragrans, cinnamon species, osmanthus, pomegranate, rubber tree, variegated ficus, Chinese hibiscus, cotton rose, Dutch iron plant, croton, Brazilian wood, money tree, Schefflera octophylla, lady palm, frangipani, bottle palm, leatherleaf mahonia, Japanese fatsia, golden-spotted aucuba, ginkgo, crape myrtle, jasmine, palm tree, Chinese rose, fishtail palm, areca palm, queen palm, cordyline, beautiful phoenix palm, fiddle-leaf fig, red maple, sago palm (South American cycad), spruce species, Schefflera, Garcinia (Clusiaceae), Buddha belly bamboo, grevillea, Aglaia odorata, Michelia alba, orange jasmine, pomelo tree, heavenly bamboo, etc.
Herbaceous flowers include: large-flowered canna, scarlet sage, early chrysanthemum, bamboo begonia, marigold, five-color pepper, spider lily, periwinkle, globe amaranth, dahlia, dragon's mouth flower, etc.
Key management points for courtyard flowers in September
I.Propagation of courtyard flowers
1. Sowing
Woody flowering plants that can be sown include: tree peony, red-flowered camellia, Michelia species, magnolia species, manglietia species, horse chestnut species, summer sweet shrub, Canary Island date palm, etc. Among them, horse chestnut seeds can be sown in furrows, with the hilum facing downward, and the covering soil should not be too deep, ideally 2 to 2.5 cm, then covered with plastic film or straw to retain moisture. Summer sweet shrub seeds can be soaked in cold water for 24 to 36 hours before sowing, and seedlings will emerge about 2 weeks after sowing. Except for summer sweet shrub, which can be stored dry until the following spring for sowing, all the other seeds mentioned above must be stored in moist sand. September is a great time for autumn sowing of herbaceous flowers. Herbaceous flower species that can be sown include: hollyhock, dianthus, tall catchfly, dwarf catchfly, pansy, snapdragon, petunia, California poppy, daisy, corn poppy, pot marigold, black-eyed Susan, iris, verbena, etc. In addition, greenhouse flowers such as cyclamen, primrose, trollius, cineraria, wax begonia, gerbera, and calceolaria can also be sown at this time, but they need to overwinter in a plastic tunnel.
Key management points for courtyard flowers in September
2. Cuttings
Using a medium of half sand and half rice husk ash as the cutting substrate, woody plants that can be propagated by moisture-retaining cuttings in the courtyard include: firethorn, leatherleaf mahonia, Michelia, bougainvillea, Weigela florida, golden-spotted aucuba, fuchsia, Viburnum macrocephalum, snowball viburnum, weigela, Brunfelsia, jasmine, Chloranthus, golden-veined shrimp plant, coral flower, rubber tree, Schefflera, cordyline, etc.
Using ordinary sandy soil as a seedbed, woody flowering plants that can be propagated by cuttings include: boxwood species, purple magnolia, Hypericum, spiraea, pomegranate, hibiscus, crape myrtle, Spiraea thunbergii, hydrangea, French holly, golden-edged privet, red-leaf barberry, heavenly bamboo, fig, oleander, serissa, gardenia, Japanese fatsia, Chaenomeles speciosa, tree peony, etc. Some herbaceous flowers can also be propagated by cuttings, such as scarlet sage, globe amaranth, marigold, sulfur cosmos, cold chrysanthemum, etc.
Key management points for courtyard flowers in September
3. Grafting
The following flowering plants can be propagated by grafting: using peony root sections as rootstock to graft superior varieties of tree peony; using peach, apricot and other seedling rootstocks for bud grafting to propagate flowering almond, ornamental peach, longevity peach, red-leaf peach, plum blossom, etc.; using green maple seedlings as rootstock, bagged moisture-retaining cleft grafting for red maple, feather maple, etc.; using Magnolia denudata seedlings as rootstock, bud grafting superior varieties of Magnolia denudata and Magnolia soulangeana; using potted purple magnolia as rootstock, approach grafting Michelia alba; using citrus seedlings as rootstock, bud grafting kumquat, etc.; using Chionanthus retusus as rootstock, approach grafting osmanthus; using potted seedling wintersweet as rootstock, approach grafting superior varieties of wintersweet.
4. Layering
Ornamental flowering plants that can be propagated by layering include: Chaenomeles speciosa, weigela, hydrangea, gardenia, oleander, winter jasmine, Forsythia, osmanthus, purple magnolia, jasmine, Michelia, camellia, Chloranthus, French holly, snowball viburnum, Viburnum macrocephalum, Spiraea thunbergii, spiraea, etc.
5. Division
Ornamental plants that can be propagated by division include: Cymbidium goeringii, Cymbidium faberi, Cymbidium ensifolium, peony, tree peony, Aglaonema, purple triangular wood sorrel, Rudbeckia, snake plant, Syngonium, multi-headed green Aglaonema, Aglaonema commutatum, sword fern, heavenly bamboo, Chaenomeles speciosa, purple magnolia, silver-striped liriope, Aspidistra, large-leaf dwarf lilyturf, etc. In addition, hyacinth, tulip, freesia, calla lily, spider lily, Peruvian scilla (Scilla peruviana) etc. can also have their bulblets divided and replanted at this time to cultivate larger flowering bulbs.
Key management points for courtyard flowers in September
II.Management of flowers planted in the ground in courtyards
1. Transplanting
Since temperatures in September are still relatively high, unless there are special circumstances, flowering plants are generally not transplanted in courtyards. If it is for the arrangement of a newly built courtyard or the renovation of an old courtyard, transplanting can be done provided the root ball is kept intact. Species include: oleander, Chinese juniper, Michelia, Sabina chinensis, osmanthus, camellia, red-leaf barberry, golden-leaf privet, boxwood species, Hypericum, French holly, red-flowered loropetalum, golden-spotted aucuba, etc. Transplanting requires heavy pruning, and strengthened watering, misting and shading management to ensure success. Some herbaceous flowers can still be planted out or potted for viewing in golden autumn October.
Species include: scarlet sage, globe amaranth, marigold, French marigold, dragon's mouth flower, cockscomb, periwinkle, sulfur cosmos, small dahlia, pot marigold, dwarf canna, early chrysanthemum, etc.
2. Pruning
Continue pruning the vigorously growing courtyard hedges and ball-shaped ornamental plants with strong sprouting ability. This is also the last pruning of the year for ball-shaped plants during the growing season in northern regions. Courtyard hedge and color-block tree species suitable for pruning mainly include: boxwood species, French holly, Photinia davidsoniae, privet, small-leaf privet, red-leaf barberry, golden-leaf privet, golden-edged Platycladus orientalis, etc. Ball-shaped ornamental plants suitable for pruning include: Chinese juniper, Sabina chinensis, boxwood, bayberry, holly osmanthus, holly, photinia, pittosporum, firethorn, Forsythia, etc. Ground-planted herbaceous flowers that can be pinched back include: scarlet sage, globe amaranth, sulfur cosmos, Kochia scoparia, marigold, French marigold, etc. Pinching should be done once every 10 days to promote a full plant shape and produce more flower clusters on side shoots. Stop pinching after late September.
For ground-planted woody flowering plants that bloom continuously over a long period, such as hybrid tea roses, floribunda roses, miniature roses, climbing roses, crape myrtle, flowering pomegranate, lantana, bougainvillea, etc., promptly cut off spent flowers and withered stems, and moderately shorten the branches that have already bloomed, which can effectively promote reblooming.
Key management points for courtyard flowers in September
3. Watering
In September, the climate is relatively dry. For trees and flowering shrubs transplanted in the courtyard in spring of the same year, continuing good watering and misting management is one of the key measures to consolidate their survival results. First, water the roots to keep the soil moist but not waterlogged; second, spray water on the straw ropes wrapped around the trunks to create a locally moist protective layer for the trunk; third, spray water on the canopy to reduce leaf transpiration and increase local humidity. In addition, for newly planted herbaceous flowers, also do a good job of misting to retain moisture.
4. Fertilizing
For ground-planted colorful foliage plants, such as golden-leaf privet, red-leaf barberry, red maple, red-flowered loropetalum, variegated shell ginger, croton, golden-spotted aucuba, red mulberry, red-leaf dwarf cherry, red-leaf plum, red-leaf peach, etc., in order to keep their leaf color bright and vivid, appropriately apply additional phosphorus and potassium fertilizer.
For ground-planted flowering plants that bloom continuously or are viewed for flowers and fruits in autumn, such as crape myrtle, Chinese rose, Osmanthus fragrans 'Rixianggui', four-season mandarin, flowering pomegranate, bougainvillea, cotton rose, chrysanthemum, canna, dahlia, lantana, heavenly bamboo, firethorn, Ardisia crenata, kumquat, etc., as well as a large number of ground-planted autumn herbaceous flowers, it is advisable to apply a quick-acting fertilizer with balanced nitrogen, phosphorus and potassium. For kumquat, silver osmanthus, and golden osmanthus that are currently blooming, fertilization can be stopped during the flowering period.
5. Pest and disease control
For the green slug moth that damages crape myrtle, firethorn, crabapple and other flowering plants, spray 800 times dilution of 90% trichlorfon crystal for control; for the star longhorn beetle that damages crape myrtle, papaya, and crabapple, insert toxic sticks into the insect holes for control; for powdery mildew appearing on Chinese rose and chrysanthemum plants, apply 1000 times dilution of 50% carbendazim wettable powder in the early stages of the disease for control. 6. Seed collection Woody ornamental plants from which seeds can be collected are mainly flowering plants of the Magnoliaceae family.
Such as Oyama magnolia, Michelia, purple magnolia, Magnolia denudata, Magnolia wilsonii, Michelia chapensis, Michelia multiflora, Michelia maudiae, southern magnolia, etc. In addition, there are horse chestnut species, crape myrtle, lilac, crabapple species, redbud, Exochorda racemosa, yew, shiny-leaf wintersweet, etc. For Magnoliaceae as well as yew, horse chestnut, crabapple species, etc., the seeds must be stored in moist sand until early spring of the following year after treatment, and sown after the seeds crack.
Herbaceous flower seeds that can be collected include: marigold, zinnia, garden balsam, four o'clock flower, cockscomb, periwinkle, strawflower, China aster, etc. After collection, thresh promptly and store dry until the following spring for sowing.
Key management points for courtyard garden flowers in September
In September, temperatures in most parts of China gradually decline, with the monthly average temperature between 20°C and 24°C. This month is suitable for a wide variety of potted ornamental plants displayed in courtyards.Among them, the woody ornamental plant species include: Norfolk Island pine, five-needle pine, golden larch, Japanese umbrella pine, lacebark pine, Japanese fir, Buddhist pine, podocarpus, sago palm, Canary Island date palm, Australian tree fern, Fagraea fragrans, cinnamon species, osmanthus, pomegranate, rubber tree, variegated ficus, Chinese hibiscus, cotton rose, Dutch iron plant, croton, Brazilian wood, money tree, Schefflera octophylla, lady palm, frangipani, bottle palm, leatherleaf mahonia, Japanese fatsia, golden-spotted aucuba, ginkgo, crape myrtle, jasmine, palm tree, Chinese rose, fishtail palm, areca palm, queen palm, cordyline, beautiful phoenix palm, fiddle-leaf fig, red maple, sago palm (South American cycad), spruce species, Schefflera, Garcinia (Clusiaceae), Buddha belly bamboo, grevillea, Aglaia odorata, Michelia alba, orange jasmine, pomelo tree, heavenly bamboo, etc.
Herbaceous flowers include: large-flowered canna, scarlet sage, early chrysanthemum, bamboo begonia, marigold, five-color pepper, spider lily, periwinkle, globe amaranth, dahlia, dragon's mouth flower, etc.
I. Propagation of courtyard flowers
1. Sowing
Woody flowering plants that can be sown include: tree peony, red-flowered camellia, Michelia species, magnolia species, manglietia species, horse chestnut species, summer sweet shrub, Canary Island date palm, etc. Among them, horse chestnut seeds can be sown in furrows, with the hilum facing downward, and the covering soil should not be too deep, ideally 2 to 2.5 cm, then covered with plastic film or straw to retain moisture. Summer sweet shrub seeds can be soaked in cold water for 24 to 36 hours before sowing, and seedlings will emerge about 2 weeks after sowing. Except for summer sweet shrub, which can be stored dry until the following spring for sowing, all the other seeds mentioned above must be stored in moist sand. September is a great time for autumn sowing of herbaceous flowers. Herbaceous flower species that can be sown include: hollyhock, dianthus, tall catchfly, dwarf catchfly, pansy, snapdragon, petunia, California poppy, daisy, corn poppy, pot marigold, black-eyed Susan, iris, verbena, etc. In addition, greenhouse flowers such as cyclamen, primrose, trollius, cineraria, wax begonia, gerbera, and calceolaria can also be sown at this time, but they need to overwinter in a plastic tunnel.
2. Cuttings
Using a medium of half sand and half rice husk ash as the cutting substrate, woody plants that can be propagated by moisture-retaining cuttings in the courtyard include: firethorn, leatherleaf mahonia, Michelia, bougainvillea, Weigela florida, golden-spotted aucuba, fuchsia, Viburnum macrocephalum, snowball viburnum, weigela, Brunfelsia, jasmine, Chloranthus, golden-veined shrimp plant, coral flower, rubber tree, Schefflera, cordyline, etc.
Using ordinary sandy soil as a seedbed, woody flowering plants that can be propagated by cuttings include: boxwood species, purple magnolia, Hypericum, spiraea, pomegranate, hibiscus, crape myrtle, Spiraea thunbergii, hydrangea, French holly, golden-edged privet, red-leaf barberry, heavenly bamboo, fig, oleander, serissa, gardenia, Japanese fatsia, Chaenomeles speciosa, tree peony, etc. Some herbaceous flowers can also be propagated by cuttings, such as scarlet sage, globe amaranth, marigold, sulfur cosmos, cold chrysanthemum, etc.
3. Grafting
The following flowering plants can be propagated by grafting: using peony root sections as rootstock to graft superior varieties of tree peony; using peach, apricot and other seedling rootstocks for bud grafting to propagate flowering almond, ornamental peach, longevity peach, red-leaf peach, plum blossom, etc.; using green maple seedlings as rootstock, bagged moisture-retaining cleft grafting for red maple, feather maple, etc.; using Magnolia denudata seedlings as rootstock, bud grafting superior varieties of Magnolia denudata and Magnolia soulangeana; using potted purple magnolia as rootstock, approach grafting Michelia alba; using citrus seedlings as rootstock, bud grafting kumquat, etc.; using Chionanthus retusus as rootstock, approach grafting osmanthus; using potted seedling wintersweet as rootstock, approach grafting superior varieties of wintersweet.
4. Layering
Ornamental flowering plants that can be propagated by layering include: Chaenomeles speciosa, weigela, hydrangea, gardenia, oleander, winter jasmine, Forsythia, osmanthus, purple magnolia, jasmine, Michelia, camellia, Chloranthus, French holly, snowball viburnum, Viburnum macrocephalum, Spiraea thunbergii, spiraea, etc.
5. Division
Ornamental plants that can be propagated by division include: Cymbidium goeringii, Cymbidium faberi, Cymbidium ensifolium, peony, tree peony, Aglaonema, purple triangular wood sorrel, Rudbeckia, snake plant, Syngonium, multi-headed green Aglaonema, Aglaonema commutatum, sword fern, heavenly bamboo, Chaenomeles speciosa, purple magnolia, silver-striped liriope, Aspidistra, large-leaf dwarf lilyturf, etc. In addition, hyacinth, tulip, freesia, calla lily, spider lily, Scilla peruviana, etc. can also have their bulblets divided and replanted at this time to cultivate larger flowering bulbs.
II. Management of flowers planted in the ground in courtyards
1. Transplanting
Since temperatures in September are still relatively high, unless there are special circumstances, flowering plants are generally not transplanted in courtyards. If it is for the arrangement of a newly built courtyard or the renovation of an old courtyard, transplanting can be done provided the root ball is kept intact. Species include: oleander, Chinese juniper, Michelia, Sabina chinensis, osmanthus, camellia, red-leaf barberry, golden-leaf privet, boxwood species, Hypericum, French holly, red-flowered loropetalum, golden-spotted aucuba, etc. Transplanting requires heavy pruning, and strengthened watering, misting and shading management to ensure success. Some herbaceous flowers can still be planted out or potted for viewing in golden autumn October.
Species include: scarlet sage, globe amaranth, marigold, French marigold, dragon's mouth flower, cockscomb, periwinkle, sulfur cosmos, small dahlia, pot marigold, dwarf canna, early chrysanthemum, etc.
2. Pruning
Continue pruning the vigorously growing courtyard hedges and ball-shaped ornamental plants with strong sprouting ability. This is also the last pruning of the year for ball-shaped plants during the growing season in northern regions. Courtyard hedge and color-block tree species suitable for pruning mainly include: boxwood species, French holly, Photinia davidsoniae, privet, small-leaf privet, red-leaf barberry, golden-leaf privet, golden-edged Platycladus orientalis, etc. Ball-shaped ornamental plants suitable for pruning include: Chinese juniper, Sabina chinensis, boxwood, bayberry, holly osmanthus, holly, photinia, pittosporum, firethorn, Forsythia, etc. Ground-planted herbaceous flowers that can be pinched back include: scarlet sage, globe amaranth, sulfur cosmos, Kochia scoparia, marigold, French marigold, etc. Pinching should be done once every 10 days to promote a full plant shape and produce more flower clusters on side shoots. Stop pinching after late September.
For ground-planted woody flowering plants that bloom continuously over a long period, such as hybrid tea roses, floribunda roses, miniature roses, climbing roses, crape myrtle, flowering pomegranate, lantana, bougainvillea, etc., promptly cut off spent flowers and withered stems, and moderately shorten the branches that have already bloomed, which can effectively promote reblooming.
3. Watering
In September, the climate is relatively dry. For trees and flowering shrubs transplanted in the courtyard in spring of the same year, continuing good watering and misting management is one of the key measures to consolidate their survival results. First, water the roots to keep the soil moist but not waterlogged; second, spray water on the straw ropes wrapped around the trunks to create a locally moist protective layer for the trunk; third, spray water on the canopy to reduce leaf transpiration and increase local humidity. In addition, for newly planted herbaceous flowers, also do a good job of misting to retain moisture.
4. Fertilizing
For ground-planted colorful foliage plants, such as golden-leaf privet, red-leaf barberry, red maple, red-flowered loropetalum, variegated shell ginger, croton, golden-spotted aucuba, red mulberry, red-leaf dwarf cherry, red-leaf plum, red-leaf peach, etc., in order to keep their leaf color bright and vivid, appropriately apply additional phosphorus and potassium fertilizer.
For ground-planted flowering plants that bloom continuously or are viewed for flowers and fruits in autumn, such as crape myrtle, Chinese rose, Osmanthus fragrans 'Rixianggui', four-season mandarin, flowering pomegranate, bougainvillea, cotton rose, chrysanthemum, canna, dahlia, lantana, heavenly bamboo, firethorn, Ardisia crenata, kumquat, etc., as well as a large number of ground-planted autumn herbaceous flowers, it is advisable to apply a quick-acting fertilizer with balanced nitrogen, phosphorus and potassium. For kumquat, silver osmanthus, and golden osmanthus that are currently blooming, fertilization can be stopped during the flowering period.
5. Pest and disease control
For the green slug moth that damages crape myrtle, firethorn, crabapple and other flowering plants, spray 800 times dilution of 90% trichlorfon crystal for control; for the star longhorn beetle that damages crape myrtle, papaya, and crabapple, insert toxic sticks into the insect holes for control; for powdery mildew appearing on Chinese rose and chrysanthemum plants, apply 1000 times dilution of 50% carbendazim wettable powder in the early stages of the disease for control. 6. Seed collection Woody ornamental plants from which seeds can be collected are mainly flowering plants of the Magnoliaceae family.
Such as Oyama magnolia, Michelia, purple magnolia, Magnolia denudata, Magnolia wilsonii, Michelia chapensis, Michelia multiflora, Michelia maudiae, southern magnolia, etc. In addition, there are horse chestnut species, crape myrtle, lilac, crabapple species, redbud, Exochorda racemosa, yew, shiny-leaf wintersweet, etc. For Magnoliaceae as well as yew, horse chestnut, crabapple species, etc., the seeds must be stored in moist sand until early spring of the following year after treatment, and sown after the seeds crack.
Herbaceous flower seeds that can be collected include: marigold, zinnia, garden balsam, four o'clock flower, cockscomb, periwinkle, strawflower, China aster, etc. After collection, thresh promptly and store dry until the following spring for sowing.