When is the best time to plant roses?
The rose is one of the world's famous ornamental plants and has a long history of cultivation in China. After roses were introduced to China in the 18th to 19th centuries, they were crossed and repeatedly backcrossed with existing varieties, producing cultivars such as the Chinese rose, the tea rose, the wild rose and the rose, with extremely high ornamental value. Let's take a look below at when roses should be planted!
When are roses planted?
Roses can be planted in all four seasons of the year, keeping the root system moist during the growing season and protecting against cold in winter, but the period from leaf fall in autumn to bud break in spring is preferable, and the time from leaf fall in autumn to before the ground freezes is the best planting period. To help the plant grow as quickly as possible and expand the flower cluster, planting must be done in large holes, with each hole 1 m long and wide and 0.6 to 0.8 m deep, or by digging a planting trench 0.6 to 0.8 m deep and wide. Apply organic fertilizer and superphosphate per plant, mix them evenly with the soil and apply them concentrated at a soil depth of 0.2 to 0.5 m, firm the soil after planting, and water thoroughly in time.
Propagation methods for roses
Rose seeds can be used for raising seedlings, but in production softwood cuttings from the current year are mostly used, as they root easily. Rare and precious varieties are harder to root from cuttings and can be propagated by layering or grafting; seedlings from asexual propagation can bloom in the same year. For seedlings used as potted flowers, older branches of superior varieties should be selected and propagated by layering, and attention should also be paid to pruning the main bud and carrying out artificial dwarfing. For seedlings used as cut flowers, varieties that can form flower-bearing mother branches and have large, brightly colored flowers should be selected for propagation. Roses can also be propagated by tissue culture, water culture, division and other methods.
How to grow roses
1. Soil: Roses are not strict about soil, tolerating drought and poor soil. For cultivation, they grow best in deep, loose, fertile, moist soil with good drainage, and they can also grow normally in heavy clay soil. Whether planted in the ground or in pots, the growing medium for roses is best made of fully decomposed sandy soil.
2. Light: Roses are light-loving flowers and prefer plenty of sunlight, though they also tolerate partial shade and are fairly cold-hardy, with very strong adaptability. Except for overwintering in severe winter cold, they can be planted throughout the south. During the growing period, roses should be ensured plenty of sunlight so they can grow lush foliage and bloom abundantly.
3. Watering: Roses like moisture but fear waterlogging and are averse to standing water. From bud break to before flowering, they can be watered somewhat more, with soil kept moist but not waterlogged as the ideal. After the roses finish flowering, the amount of watering should be reduced; when watering, the soil should be allowed to dry and then be watered wet, and in the rainy season attention should be paid to drainage and waterlogging prevention to avoid root rot from standing water.
4. Fertilizing: Roses are fairly fond of fertilizer and also tolerate poor soil. In March, a nitrogen-based liquid fertilizer can be applied 1 to 2 times to promote lush branches and leaves. In April and May, a phosphorus- and potassium-based fertilizer can be applied 2 to 3 times to encourage more flower buds and more blooms. After flowering, apply a rejuvenating fertilizer once, and then fertilizing can be stopped. Roses need to be earthed up and fertilized once each winter.
5. Pruning: Pruning and shaping is an indispensable step in growing most flowers, and natural roses are no exception; especially when growing them as potted flowers, even more attention should be paid to pruning and shaping. Generally, mature roses are pruned once each year before growth starts in spring, with a moderate amount, ensuring the rose branches are neither too dense nor too sparse and simply look attractive. Each winter, the old branches and densely growing branches of roses should be pruned regularly to maintain good light penetration and ventilation, which can reduce pests and diseases.