“
WHILE YELLOW LEAVES
are a cause for concern, you’ll
need to find other symptoms
before you can decide on a treatment.”
7
Normal Aging
Yellowing leaves look alarming — and sometimes they
are. But just occasionally, plants need to lose a leaf or
two. We’re familiar with the fall leaf drop, but what’s less
well known is that evergreen trees do this too, shedding a few
older leaves gradually through the year. Brassicas (like cabbages,
calabrese, and sprouts) also do this naturally as they mature.
As long as you can’t see any other more sinister developments,
such as wilting or the loss of young leaves, there’s nothing to worry
about. This is a perfectly natural process, known as senescence, in
which the leaf stops growing or photosynthesising as the plant no
longer needs it. It loses its green coloring, dies and then drops away,
leaving the rest of the plant to grow on as normal. It’s worth picking
up the yellowing leaves, so they don’t become havens for fungal
diseases like botrytis — but otherwise, you don’t need to do a thing.
When you spot that yellow warning light among your plants, it’s
worth sitting up and taking notice. But you’ll need to look closer
to find out what’s really ailing them. Once you’re confident of your
diagnosis, act quickly, apply the right medicine, and in most cases,
the patient will make a full recovery.
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48
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