Why does the back of rose leaves turn purple in spring?

When roses sprout in spring, what I fear most is the cold in late spring. The cold in late spring is easy to frostbite buds and buds, especially buds, which are easy to freeze and lead to no new branches. Maintain roses in spring. When the temperature rises, fertilize the buds in time, loosen the soil reasonably, get more sunshine, and pay attention to the prevention and control of aphids. As long as the buds are full and the shoots are strong, it is easy to bloom in the later stage.

Let's look at the pictures provided by netizens:

As can be seen from the picture, this netizen's rose must be in poor condition, and the leaves are small and thin. Of course, you can't see the purple that netizens say. It is estimated that the leaves have faded after a few days of pruning. The weaker the rose grows, the lower the vitality of the branches, the worse the stress resistance and the easy frostbite, especially in the late spring after the early spring. The purple color on the back of leaves is caused by temperature and light. The temperature difference is not big enough, and insufficient light can easily lead to the leaves turning purple.

1, fertilization

It is recommended that netizens immediately replenish fertilizer. If the seedlings are weak, it is suggested to dilute them with thin fertilizer and water them. After loosening the soil properly, the root activity can be ensured, as long as the buds are strong in the later stage.

2. Ventilation in the sun

Pay attention to ventilation, water less to avoid too wet roots, and then get more sunshine. The more sunshine, the more vigorous the leaves are, and the later leaves will grow thicker.

3. Temperature

When roses are in bud, the temperature difference should not be too big. Now normal maintenance, the temperature rise will slowly recover.