Thalia dealbata (Powdery Alligator-flag) Cultivation Methods and Precautions

1. Growing medium

For cultivating Thalia dealbata, the growing medium can be lake or pond silt, or garden soil, and it is best to mix in some organic fertilizer as a base fertilizer.

2. Light

Thalia dealbata is a type of plant that very much likes sunlight, but it is also very shade-tolerant. For about one week after planting, it should be kept out of direct light, especially in summer, where light exposure should be reduced, otherwise it will affect the plant's flowering.

3. Water

Thalia dealbata is an aquatic plant. When planting in spring, the water should be appropriately reduced to promote rooting and sprouting; in summer, it needs to be watered heavily to prevent high temperatures from harming the plant; in autumn and winter, water should also be appropriately controlled so it can overwinter safely.

4. Fertilizing

The growing space for Thalia dealbata is relatively small, and nutrients may be insufficient for the plant's growth. In addition to the base fertilizer, fertilizer should be applied twice a month, at a low concentration, mainly with inorganic fertilizer.

Cultivation Methods for Thalia dealbata

Flowering plants to enjoy: pomegranate, Michelia alba, Chinese rose, hibiscus, Serissa japonica, Hydrangea macrophylla, Magnolia grandiflora, jasmine, Aglaia odorata, oleander, hydrangea, Sorbaria kirilowii, gardenia, night-blooming jasmine, Hypericum, Epiphyllum, gladiolus, Hippeastrum, Begonia semperflorens, Begonia coccinea, Catharanthus roseus, Coreopsis tinctoria, Calendula officinalis, daisy, Zinnia elegans, Althaea rosea, Papaver rhoeas, Phlox drummondii, petunia, Sinningia speciosa.

Cuttings: chrysanthemum, Monstera deliciosa, Ficus elastica, Begonia semperflorens, Euphorbia milii, rhododendron, Camellia japonica, Michelia alba, Aglaia odorata, Osmanthus fragrans, Campsis grandiflora, Lagerstroemia indica, oleander, gardenia, Weigela florida, Trachelospermum jasminoides, Sabina chinensis, Serissa japonica. Softwood cuttings include Sabina chinensis 'Kaizuca', Metasequoia glyptostroboides, Buxus sinica, Ginkgo biloba.

Division: Daphne odora, Zantedeschia aethiopica, bamboos, ferns.
Grafting: Chinese rose, Camellia japonica, Michelia alba, Michelia figo.

(1) Annual and biennial herbaceous flowers. For spring-sown herbaceous flowers, May is the seedling stage. For flowers that need transplanting, after 2 true leaves, transplant them into plug trays or seedling cups, and place them in a sunny, well-ventilated spot to prevent seedlings from becoming weak or damping-off due to overcrowding and insufficient light; large-flowered Portulaca grandiflora, which grows quickly and blooms early, can be directly transplanted into the final pot or application site. For direct-sown flowers that do not need transplanting, such as Papaver rhoeas and Eschscholzia californica, thinning should be done in time. Seedlings should be maintained in a shed or on a balcony to prevent damage from heavy rain and intense sun. Weak seedlings should have fertilizer and water management strengthened, applying a dilute liquid fertilizer once a week. Begonia semperflorens seedlings dislike strong light and should be shaded by 50%. For those that need pinching to promote branching, such as Catharanthus roseus, Salvia splendens, Coleus scutellarioides, Tagetes erecta, and Tagetes patula, pinch when there are more than 10 leaves, and pinching can be done 2~3 times in a row.
For biennial flowers such as Dianthus chinensis, Papaver rhoeas, Eschscholzia californica, Brassica oleracea, Cheiranthus cheiri, Matthiola incana, Primula malacoides, and Pericallis hybrida, collect seeds before the fruit capsules split and scatter, and store them in a ventilated, dry place.

(2) Perennial flowers

Tree peony: blooms in May, with each variety flowering for 7~10 days.
Herbaceous peony: blooms in May after the tree peony, with a flowering period of 10~15 days; early-flowering and late-flowering varieties together have a flowering period of 20~30 days. Flowering varieties include Dafugui, Zhushapan, Dahongpao, Danfeng, Hongxiuqiu, Xuefeng, Yanzhidianyu, Shajinguanding, and others. In early April, disbud, leaving only one flower at the top of each stem, and set up stakes before flowering. Just like the tree peony, apply fertilizer once before and once after flowering. Herbaceous peony is drought-tolerant and afraid of waterlogging, and when grown in open ground it is rarely watered; if it is dry after fertilizing before flowering, it can be watered so the flowers are large and vivid.

Nasturtium: sow in April~May, with a night temperature of 15°C, germinating in 10 days; cuttings root in 10 days at 13~16°C. Before flowering, use chicken manure liquid fertilizer or 1% potassium dihydrogen phosphate; after flowering, use 10% cake fertilizer water. Nasturtium likes moisture and dislikes waterlogging, so water little but often, once every 2~3 days in May. After buds appear, the water amount can be larger but the frequency should be less; it needs sufficient sunlight, appropriate shading in midsummer, and a trellis. Common varieties include the Dutch 'Miaotiao' and 'Aomi'.
Geranium: varieties include 'Trail', 'Xiayu', 'Longjuanfeng', 'Lavender Afterglow', 'Hot Pink', 'Dancing Pink', 'Nano', as well as 'Ice Cream', 'Madong', and others. Early spring sowing can be pinched to promote branching; cuttings root in 10~15 days at 13~18°C.
Chrysanthemum: in May, cultivate mother plants, cut away overly dense and weak branches, and ensure sufficient fertilizer and light; 3~4 weeks before cuttings, pinch or shorten-prune to produce thick new shoots as cuttings.

(3) Bulbous flowers

Freesia: the flowering period has passed; before the plants collapse, dig up the bulbs, air-dry them in a ventilated place, and store them indoors with ventilation until autumn planting. Ranunculus: the flowering period has passed; collect seeds in time. The mother plants should be placed in a semi-shady, cool place so the leaves do not wither early, which benefits underground development. Gladiolus: suitable for planting corms.
Hippeastrum: planted in open ground, it blooms in May. Dry bulbs planted in May bloom in July. Clivia: after flowering, repot and divide in time. April~May is the suitable sowing period; at 18~25°C germination is very fast, and seeds can be sown in pots and transplanted after emergence.
Lily: Lilium longiflorum blooms in May. Dutch lilies should be fertilized in May to promote flowering, and early-flowering varieties can also bloom.

(4) Foliage plants. May is a good season for foliage plant growth. Move them outdoors early, apply a quick-acting fertilizer mainly based on nitrogen once every 10 days, generally shade by 30%~50%, and May~August is a good season for cuttings. English ivy, Dracaena sanderiana, Aglaonema modestum, and Tradescantia repens root easily in water; change the water once a month, roots can form in 10 days, and transplant before the roots grow well and age. Rhapis excelsa, Rhapis humilis, and Cycas revoluta can be sown; rhizomatous begonias and Sansevieria can be leaf-cuttings; Cordyline and Dracaena can be stem cuttings; Fittonia, Syngonium, Gynura aurantiaca, and Pilea cadierei can be leaf-bud cuttings.

May is the season for repotting foliage plants. The growing media are: for palms, 40% peat, 30% garden soil, 30% river sand; for bromeliads: 40% leaf mold, 30% tree shavings and coconut coir, 30% river sand; for ferns: 50% leaf mold, 25% peat, 25% river sand; for begonias: 40% leaf mold, 30% garden soil, 30% river sand; for Asparagus setaceus and Chlorophytum comosum: 50% garden soil, 25% leaf mold, 25% river sand.

(5) Cacti and succulents. May is the season for cactus growth and propagation. For grafting, use Hylocereus undatus (suitable for Echinocactus and Echinopsis), Pereskia aculeata, Echinopsis, and Aporocactus as rootstocks. Perform grafting on sunny days at 20~25°C. For flat grafting, cut the rootstock horizontally, then make a 20~45 degree cut along the edge, cut the lower part of the scion horizontally, with a thickness of more than 1/3~1/4 of the diameter, immediately place it on the rootstock, align the vascular bundles of the rootstock and scion, and tie it vertically with thin thread. Cleft grafting is used for Schlumbergera and Zygocactus; cut horizontally 15~30 cm above the pot surface, make a wedge-shaped cut at the top or on the side near the edge, cut the scion into a duck-bill shape, insert it into the rootstock, fix it with pins, spines, or wooden clips, and place it in a wind-protected, shaded place, keeping it at 25°C and covering it.

For cuttings, use river sand, vermiculite, and perlite as the growing medium; rooting is easy at 20~24°C. For winter-dormant types, cuttings from mid-April to early June; for summer-dormant types, late September to early October is best. Leaf cuttings, stem cuttings, or root cuttings can be used. The cuttings should be 5~10 cm long; wait until they are dry before inserting, and for wounds that exude white sap, apply sulfur powder, and insert 1/3~1/2 into the soil.

Cacti have two ecological types. One is epiphytic on tree trunks and rock walls, with flat leaf-like or slender columnar stems, growing in tropical rainforests, such as Epiphyllum, Epiphyllum, Schlumbergera, Schlumbergera, Aporocactus, and Hylocereus; they like to be planted in moist growing media rich in humus, loose, and well-drained, like semi-shade and high air humidity, and dislike direct intense sunlight; in summer they should be shaded, misted more, and given a liquid fertilizer containing potassium once every 15~30 days. The other type is native to deserts and gravel areas, spherical or flattened, propagated by offsets, and suitable for planting in sand, gravel, and other growing media with lower nutrients and good drainage; it likes light relatively more, and except for 30% shading in hot summer, can receive direct sunlight; it is extremely drought-tolerant, and during the growing season the medium should be kept moist; apply low-concentration fertilizer once a month so it grows luxuriantly, with more and larger offsets. In May, many cacti begin to bloom.
Succulent plants need sufficient sunlight and moist growing media in May, and should be given liquid fertilizer once every half month to promote the growth of branches and leaves.

(6) Woody flowers
Western azalea: the flowering period of Western azalea ends in May. If not managed well, it very easily dies, so attention should be paid to management after flowering.
Chinese rose: April~May is the spring flowering period. Apply fertilizer before the first flowers bloom. Chinese rose extremely likes light; with good light, black spot disease is mild. Attention should be paid to the prevention and control of black spot, powdery mildew, and aphids. Alternating 75% chlorothalonil at 1000 times and 70% thiophanate-methyl gives a particularly good disease-prevention effect.
Jasmine: in May, jasmine enters the new shoot growth period, so fertilizer and water management should be strengthened; therefore watering should be frequent, but waterlogging should be avoided.

Michelia alba: Michelia alba blooms in May, and the pot soil should be kept moist but not waterlogged. Michelia alba has large leaves and thick stems, likes fertilizer, and dislikes concentrated fertilizer.
Hydrangea: in May, current-year shoots with leaves (2~3 pairs of leaves) can be selected for cuttings. Hydrangea likes moisture and cannot lack water during the growing period; when water is lacking, the leaves wilt, and after watering they recover quickly, but flower bud differentiation is affected. Hydrangea likes nitrogen fertilizer; from April onward, apply fertilizer with a nitrogen:phosphorus:potassium ratio of 2:2:1~3 2~4 times per month; after May, reduce fertilizing to avoid overly vigorous growth that affects flower bud differentiation. From May~September, shade by 20%~50%; during the vigorous growth period, spray foliage with 1000 mg/L paclobutrazol to dwarf it.

Bergamot, Citrus wilsonii, Citrus aurantium 'Daidai', and lemon easily drop flowers and fruit in May. To prevent fruit drop, pinch the tender shoots and spray 40 mg/L naphthaleneacetic acid, fruit-setting hormone, or 100 mg/L gibberellin 2~3 times. For trees and branches that grow too vigorously, ring-cut or girdle the trunk or branch base, with a width of 0.2~0.5 cm.

Potted Cultivation Methods for Thalia dealbata and Planting Density of Thalia dealbata

The flower language and flowering period of Thalia dealbata have already been shared with everyone, so surely some friends can't wait to grow it. Next, Xiao Qi will share with everyone the potted cultivation methods for Thalia dealbata and the planting density of Thalia dealbata.

1. Potted Cultivation Methods for Thalia dealbata

1. Container selection: For potted Thalia dealbata, aquatic plant planting containers with both height and inner diameter greater than 20 cm should generally be selected, such as vats, bowls, pots, bags, etc. Sometimes, for plant landscaping needs, factors such as the texture and appearance of the container also need to be considered when choosing a container.

2. Planting medium: The medium used for planting Thalia dealbata can be lake or pond silt, or garden soil can be used directly, especially garden topsoil. If raw soil is used, it is best to mix in a certain amount of organic fertilizer as a base fertilizer when planting.

3. Planting method: When planting Thalia dealbata, first put planting medium into the container to a depth of 1/3-1/2 of the container height, then add water to the container until it reaches 2/3 of the container height, and then planting can be carried out together with division. When planting, generally plant the vegetative propagule in the very center of the container, at a depth of about 5 cm.

4. Light management: Thalia dealbata is a light-loving plant, but it can also tolerate shade. For about 1 week after division and transplanting, especially when planted with leaves, appropriate shading treatment should be given. Especially in summer, because the water layer in the planting container is relatively shallow, strong light will quickly raise the water temperature, which is very unfavorable for plant growth and may even affect survival.

5. Water layer management: For container-grown Thalia dealbata, the water layer in spring should mainly be shallow water to help raise the medium temperature and promote rooting and sprouting; in summer, deep water should mainly be used to prevent the water temperature from getting too high and harming the plant. In autumn and winter, appropriately control water to help it overwinter safely.

6. Nutrient management: Because the nutrient conditions of the medium in the planting container are limited, in addition to the base fertilizer, the number of topdressings should be noticeably more than in open-field production. "Apply thin fertilizer frequently" is the basic principle. The type and concentration of fertilizer should be determined according to the different growth stages of the plant, generally mainly inorganic fertilizer, and at the same time organic fertilizer should be appropriately topdressed.

2. Planting Density of Thalia dealbata

The planting density in a Thalia dealbata nursery is generally larger, and the plant and row spacing can be controlled at 1 m x 1 m. The density for ornamental cultivation should be smaller to facilitate rapid landscape formation, and the plant and row spacing can be controlled at about 0.6 m x 0.6 m. Because the underground stems of Thalia dealbata are thick and strong, the underground stem diameter of a 1-year-old plant can reach 3-4 cm, so the planting depth can reach 10 cm.

The above isPotted Cultivation Methods for Thalia dealbataandPlanting Density of Thalia dealbatashared. If conditions permit, it can be planted in the ground, planting a patch of Thalia dealbata. When the flowers bloom, it will absolutely be a scenic view.