Why are My Guava Leaves Yellow?
Oftentimes, when a gardener reports yellowing guava leaves, it’s on a tree that’s being grown in a pot and overwintered indoors. Guava trees can’t really tolerate temperatures below freezing, which means that gardeners in most zones have to bring them inside for the colder months. This is the likeliest reason for yellow leaves on a guava tree – a combination of different light, water, and humidity. It’s especially common for this yellowing to happen in the spring, at the point when the tree has spent the most time indoors. Usually, the yellowing will begin at the lowest leaves and work its way up. Some may even fall off. Luckily, guava trees are very resilient. If your tree seems to be yellowing over the winter, the best thing to do is wait for warmer weather. Once it’s back outside, it ought to perk up.
Other Causes for Yellow Guava Leaves
Of course, not all yellow leaves on a guava tree are due to overwintering. If your tree is outdoors in the heat, there are a number of other possible causes. Most plants will turn yellow as a sign of stress – if the weather is exceptionally hot or cool and/or wet or dry, this could be the culprit. There is also a chance that the yellowing leaves are a symptom of nematodes. There are a number of nematodes that attack guava tree roots. To discourage nematode infestations, mulch your guava trees and pay special attention to fertilizer and water. And always avoid planting where there is a known nematode infestation.
