Overwatering causes most rose leaf yellowing. Roses abhor waterlogging and prefer wet, well-draining soil. If the soil lacks drainage, overwatering can cause root rot.
Another cause of fading rose leaves is underwatering. Roses struggle in dry soil. Underwatering is a major issue in drought and hot summers.
Roses without adequate sunlight may grow yellow leaves. Roses need six hours of full light, particularly in the morning. Without sunlight, roses won't bloom or grow well.
Most roses can thrive in USDA Hardiness Zones 4–11. However, some roses dislike heat. Zones 9–11 roses may produce yellow leaves in hot or dry circumstances.
Yellowing leaves can also occur in roses without appropriate nourishment. Roses need nitrogen- and phosphorus-rich soils. Roses with insufficient nourishment will grow weakly and have yellow foliage.
Over-fertilizing roses can damage them, while regular fertilization helps them bloom.
Roses can also have yellow foliage in poor soil. Roses prefer pH 6.0–7.0 soils. Roses do not like acidic or alkaline soils, which can yellow the foliage.
Rose leaves can yellow from numerous illnesses. Fungal infections like black spot and rose mosaic virus are frequent. Some rose illnesses are lethal, while others aren't.
Roses can also be attacked by aphids and spider mites. Yellow leaves can indicate a pest problem in your rose. Drooping leaves and insect colonies are other signs.