I've just purchased alfalfa meal, and rock phosphate to add to my raised bed. What is a good, preferably organic, source for potassium, that I can work into the top 4"?
Thanks for the advice. Sometimes it's still a better deal to pay the high shipping for bulk rather than paying retail for a puny box. I'll check amazon.
I have no idea if it works as a source, but there's an aphid spray I use that's made out of potassium soap...I would think the plants use it too as a foliar spray.
No one ships FREE. Shipping charges are simply added to the product price. They have everything, and it's all top notch. But, their higher prices reflect the supposed FREE shipping.