Ask-a-Dave's-Gardener: my strawberries are going black, 0 by netts

netts wrote:
Hi, I wonder if you can help.

I have a hanging strawberry plant which has lots of leaves, yellow flowers and green fruit but before the berries go red they go black. Why is this and what can I do about it?
I water it once a day and feed it tomatoe feed once a week.
I have taking cuttings from it and they are growing nicely in a pot.

This is a first for me.

I look forward to hearing from you soon.

Thank you