What to Do About Yellow Leaves on Clematis in Summer? Two Tricks to Keep Foliage Lush and Flowers Blooming Nonstop

A gardening friend's clematis has withered yellow leaves, as shown in the picture below, and they asked me what causes yellowing clematis leaves and how to fix it. It is summer now, and clematis is prone to yellowing leaves, but it is a mild yellowing, not this severe yellowing with dry rot.

This situation is mainly caused by two possibilities. One is overwatering, meaning the potting soil stays in a very wet state for a long time, causing the roots to rot. Summer itself is hot, and if the soil stays too wet for too long and drains poorly, root rot will occur. The first sign of root rot shows on the leaves, and then the leaves gradually rot and dry up. The solution is to cut off all the withered leaves, and any leaves that are even slightly yellowing should also be cut off entirely. After cutting, use mancozeb or thiophanate-methyl diluted with water to spray the leaves once, and along with that, thoroughly water the potting soil until it is soaked through. After that, spray once about a week apart, and generally two to three times will effectively control it. Next time, remember not to water too frequently.

Another situation is caused by improper fertilizing, where too much fertilizer has burned the roots. If you have over-fertilized, the first thing to do is flush the potting soil several times with clean water. Cut off the rotten leaves. Once the roots are burned, water as little as possible, keep the potting soil moist, and only resume normal watering once you see normal growth. Especially in summer, remember that too high a fertilizer concentration will burn the roots, and recovery afterward is very difficult.

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