It will turn brown in about two weeks.. You will probably know by the smell, although nettle stew is not as bad as comfrey. Pour off/strain the liquid. Dilute so that it looks like weak tea. About 1 part nettle stew to 19 parts water. ( 500ml in a watering can full) is a good tonic for leafy plants like cabbages that need a lot of nitrogen. You can use it all brassicas, cabbage, kale, etc.
Comfrey is higher in potash and is better on flowering plants like tomatoes, potatoes, courgettes etc.
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It will turn brown in about two weeks.. You will probably know by the smell, although nettle stew is not as bad as comfrey. Pour off/strain the liquid. Dilute so that it looks like weak tea. About 1 part nettle stew to 19 parts water. ( 500ml in a watering can full) is a good tonic for leafy plants like cabbages that need a lot of nitrogen. You can use it all brassicas, cabbage, kale, etc.
Comfrey is higher in potash and is better on flowering plants like tomatoes, potatoes, courgettes etc.