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Strawberries grown in Gutter turning brown before maturity
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Hello all, We started strawberries in gutters in September (we live in Florida) Starting late January we started getting a TON of berries (these are all heirloom small berry varieties and are everbearing). Then about late march something changed an nearly all the berries are now turning brown, hard and dying before they are ready to pick. some are doing this while they are still smaller than a pea.
Does anyone have any idea what is causing this and how to fix it?
I have experimented in different gutters adding egg shells, coffee grounds or both. None of this seams to change the outcome.

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I'd suggest they've used up all the available nutrition, and, as pansyface says, they grow best in a temperate climate which is what we have here in Britain. They grow very well here in Scotland - we have a lot of rainfall and less sun than further south so are usually grown undercover by commercial growers, but are perfectly happy in domestic gardens as long as they don't get waterlogged.
I'd get them in the ground too, or if that's not an option, get them into some decent sized containers and give them enough water and nutrition to support their growth
I live in west central Scotland - not where that photo is...
Well Florida is the commercial strawberry capital or the world so the climate is near perfect for what they like. We have many commercial growers who grow them in gutters as well. Is there any certain nutriant you can think of that I might need to supplement?