Hosta leaves can turn yellow from frost, sunburn, heat stress and disease. Like people, trees and plants are not immune to disease, injury and harm from the elements. Hosta plants are no exception, and like many plants a... More »

Oleanders are susceptible to the bacteria Xylella fastidiosa, which causes a yellowing of leaves called leaf scorch. The bacteria is mostly found in southern California and is spread by insects. More »

Rhododendron leaves turn yellow because of sun exposure, according to the Victoria Rhododendron Society. Sunlight tends to bleach exposed leaves. When this occurs, adding nitrogen helps turn the leaves green again. More »

According to the Missouri Botanical Garden, heat stress or fungal disease can lead to the yellowing of hosta. Scorch or heat stress leads to browning leaf margins and yellow areas between the main leaf veins. Fungal dise... More »

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To properly winterize daylilies, trim away browning and dead leaves and blooms before the first frost to protect root balls. Winterizing may also include thinning large clumps and clearing dirt away from the base of any ... More »

Agriculture and Rural Development of Alberta explains that yellow leaves on a cucumber plant may indicate exposure to warm, humid conditions with low light levels in the lower canopy of the plants. Yellow leaves may also... More »

Oleanders are susceptible to the bacteria Xylella fastidiosa, which causes a yellowing of leaves called leaf scorch. The bacteria is mostly found in southern California and is spread by insects. More »