I've only planted my rhubarb this year so they won"t be ready to harvest until next year. I found them very hard to establish, they kept dying back. A fungus grew which infected the plant and caused some of the leaves to discolour and die. To help them along and try rid the fungus I sprayed them with washing-up liquid and water. - This is ... organic / non-chemical mixture that can help your plants. Luckily enough, the fungus died away and bit-by-bit my rhubarb came back and it"s now flourishing!
How to grow rhubarb:
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