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Originally Posted by Ben Tuinman
Started this plant from seeds this spring. It's doing well and blooming in a
container on our patio where it gets sunshine in abundance. Lately the plant
has developed many yellow leafs, at the bottom as well as elsewhere in its
foliage. This does not seem to have hindered its growth or flower buds, and
looks otherwise "healthy"... What could be the cause of the yellowing leafs
? It has been very hot and humid here in S.Ontario for many weeks. Excessive
watering ? Needs fertilizing ? Too high heat or too much sun ? Thanks !
B.T.
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Yellow leaves at the bottom of a plant usually means that the plant needs nitrogen. It starts to spread up the plant if its nitrogen needs are not met. I suspect some fertiliser which includes micronutrients (not just the big 3, Nitrogen phosphorus and Potassium) will be all it needs. Do not add fertiliser if the soil is dry and the temperatures are above 30 C. It will burn the plant.