I have 5 of my 10 angelica plants still alive. They seem to lack structural integrity because all their branches broke at the point

Question

where they branched from the main trunk. Is it too late to give them potash/potassium? How much should I give? Does anyone know what the exact PH of the soil should be to ensure the proper growth of Angelica plants?

Answer 1

Research says that you should fertilize the plants monthly with a 10-10-10 fertilizer or apply compost at the base. Your soil should be slightly acidic or neutral. Angelica likes loamy soil but isn't terribly particular, as long as the other growing requirements are met.

Here's an article for you:
https://www.gardeningknowhow.com/edible/herbs/angelica/growing-angelica-herb.htm