Reasons for Yellowing Leaves on Rose Bushes and How to Deal With Them

Beautiful roses are deeply loved by people and are often planted in outdoor courtyards and in pots. With their vivid flower colors and large buds, they serve a decorative purpose. Many beginners growing flowers discover that rose leaves turn yellow, and what causes this? What are the ways to deal with it?

I. Causes of yellowing rose leaves and how to deal with them

1. Caused by improper watering

Cause: Roses like moisture but fear excessive wetness and waterlogging, so watering must be controlled with particular care. Often, when watering, the soil ends up too wet or too dry, that is, too much or too little water is given, and either can cause rose leaves to turn yellow.

Solution: When watering roses, be sure to do so appropriately, and be careful not to let water accumulate around the roots of the rose.

2. Caused by rose rust disease

Cause: Rust disease is a very common disease of roses, and both the leaves and new branches of roses can be affected by rust.

If it is not addressed in time and the rust becomes severe, it can make the rose leaves yellow and then drop in large numbers, which not only affects the beauty of the rose and greatly reduces its ornamental value, but in severe cases can also cause the plant to die.

Solution: If roses are found to have rust disease, deal with it promptly. The treatment method is to spray an 800-fold diluted solution of triadimefon on the leaf surface, generally once a week, and after spraying three or four times the rust disease can be resolved.

3. Improper fertilizing causes rose leaves to turn yellow

Cause: Fertilizing is something every kind of flower must go through during care, and roses are no exception. Applying too much or too concentrated fertilizer, or too little fertilizer, can cause rose leaves to turn yellow.

Solution: There is a certain technique to fertilizing. To prevent yellow leaves on roses caused by a lack of fertilizer or too much fertilizer, when fertilizing roses you should apply an appropriate amount of fertilizer to the soil in autumn. Before autumn, you can spray a small amount of fertilizer on the leaf surface of the rose. Do not fertilize too early, to prevent burning the roots of the rose.

II. How do you plant rose seeds?

Rose seeds can be used to grow seedlings, but in production, softwood cuttings from the current year are mostly used to raise seedlings, as they root easily. 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 pot flowers, older branches from superior varieties should be chosen and propagated by layering, and attention should also be paid to pruning the main bud for artificial dwarfing. For seedlings used as cut flowers, varieties that can form mother branches for cutting and have large, brightly colored flowers should be chosen for raising seedlings.

III. How do you prune potted roses?

1. Pruning after new buds grow

How do you prune potted roses? First, prune after the new buds begin to swell, and sprouting is the sign to prune. When the new buds have just grown, pruning at this time will not cause any harm to the rose. At this point, the grower needs to check whether buds and leaves are growing from the stems. If the rose has shown no sign of growth since autumn, wait a few weeks after it sprouts before pruning.

Pruning method: For young plants, cut off about 2/3 of new branches that are 30 cm or taller, and cut off about 1/2 of those that are less than 30 cm. Plants that are too small may not need pruning.

2. Pruning during the dormant period

After the frost has passed, that is, during the dormant period of the rose, which may be in January or February, depending on where you live. After frost is the best time for dead and diseased branches, because there will be no more frost, so there is no need to worry about the rose suffering low-temperature freeze damage after pruning.

Pruning method: How do you prune potted roses? At this time, growers can cut off from the base the dead branches, diseased and pest-infested branches, crossing branches, thin and weak branches, and tender branches that sprouted after autumn.

3. Pruning after blooming

The third time to prune roses is after the flowering period. Roses have strong sprouting ability and grow luxuriantly. If they are not pruned in time, under conditions of muggy heat, humidity, insufficient light and poor ventilation, they are prone to pests and diseases, so roses should be pruned once after the flowering period.

Notes: Some roses need to be pruned after flowering, while others are pruned during the dormant period. The way to judge is: if the rose grows new branches in spring and blooms on the new branches, this means it can be pruned during the dormant period; if the flowers bloom on old branches, the branches need to be cut off after flowering.