Yellowing Passion Vines
If you see your passion flower leaves turning yellow, it may be time to check the nutrients in your soil. Too much or too little of particular nutrients can cause yellow passion vine leaves. For example, if your soil contains too much boron, the leaf tips might yellow. Too little iron, magnesium, molybdenum, zinc, or manganese can also cause yellowing passion vines. In those instances, the yellow coloring will show up particularly between the leaf veins. Likewise, a nitrogen, sulfur, or potassium deficiency can cause yellow leaves on passion fruit plants. Obtain a soil sample and send it to a local soil testing laboratory for a complete analysis. Follow the lab’s recommendations for amending the soil. In the short term, solve your vine’s problems by applying blood meal and bone meal or aged chicken manure to the top of the soil, keeping it from touching the foliage. Water thoroughly.
Other Causes of Yellow Passion Vine Leaves
Insufficient water can also result in yellowing passion vines. This usually happens in potted plants when the soil dries out completely. The oldest leaves are the ones likely to yellow. Regular watering will solve this problem quickly. Passion flower leaves that turn yellow can be a result of cold weather, windy conditions, or low humidity as well. The sheer size of the plant makes it difficult to protect when freezes threaten, but generally, the many leaf layers keep the innermost foliage safe from damage. Protect your plant by choosing a planting site against a wall or deck. An attack by the cucumber mosaic virus can result in yellow passion vine leaves or at least yellow patches on the leaves. The leaves yellow, then curl and die. Limit pest damage by controlling aphids, since these tiny soft-bodied insects spread the virus. Spray the aphids thickly with insecticidal soap until the plant is dripping wet. Repeat every few weeks if additional treatment is required.
