What Causes the Yellowing and Withering of Rose Leaves in Summer
For many girls, the introduction to why rose leaves turn yellow and wither in summer and the clever tricks for treating yellow leaves in green plants and flowers are as follows:
In summer, it should be the season for roses to grow rapidly and burst into bloom, yet some potted roses have new leaves that wilt and turn black, while old leaves dry up and turn yellow, looking unhealthy. What's going on?
Actually, this is root rot, which is a common issue for roses in summer.
Reasons for Root Rot
There are mainly two reasons for root rot in summer roses.
First, waterlogging in the soil. Does soil accumulate water in summer? Absolutely. The surface of the soil dries quickly under the sun in summer, and many gardeners water their plants as soon as they see the surface is dry.
This approach is incorrect because the lower part of the soil may not be dry yet, and the roots haven't had time to breathe some oxygen. When another pot of water is poured on top, over time, the lower soil remains moist and warm, leading to root rot.
Smaller pots are better, as they dry out easily, but larger pots are particularly prone to this problem. If your balcony has poor ventilation or the soil has poor breathability, it's even worse.
Second, the use of uncomposted organic fertilizer. Many gardeners bury some manure in rose pots before winter or at the beginning of spring, with good intentions. However, using uncomposted manure can harm their plants.
Manure is an organic fertilizer that needs to be thoroughly fermented before use. If uncomposted manure is used, it may not cause a problem in the colder winter, but in the hot summer, the manure will continue to ferment, producing heat that can burn the roots. Additionally, fermentation can produce an unpleasant odor, attracting insects.
How to Prevent Root Rot?
1. Water only when the soil is completely dry. Insert a stick into the soil, reaching the middle or below, and water only when the soil on the stick is dry, not just based on the surface.
2. Use plastic or terracotta pots for planting, not ceramic ones, as ceramic pots have poor breathability and can worsen root rot.
3. Keep windows open for ventilation when caring for potted roses on a balcony or indoors, and make more holes in the soil to allow water to evaporate quickly.
4. Do not use uncomposted organic fertilizer. Manure must be fermented before use. It's not recommended for gardeners to put chunks of manure directly into the pot. It's best to buy from reputable brands and not to be tempted by cheap options, as many fertilizers on the market are uncomposted.
How to Deal with Root Rot?
First, check the cause based on your care situation. If it's due to waterlogging, stop watering, improve ventilation, and let the soil dry out quickly. If it's due to the use of uncomposted manure, change the potting soil as soon as possible.
This article shares the specific introduction to why rose leaves turn yellow and wither in summer and the clever tricks for treating yellow leaves, hoping to bring some floral knowledge to green plant enthusiasts.