Here's another valuable survival, multi purpose, cut and come again plant, comfrey. I grow it all over my garden and use every leaf as potassium rich mulch. Also rich in nitrogen, it won't rob the nitrogen already in your soil. Potassium is very soluble and leaches out of the top soil easily resulting in a potassium deficiency. Comfrey roots mine deep potassium, store it and supply it to your plants as it biodegrades as mulch. You can use this in any space in your yard or garden, one plant or a group. Easy to care for, almost set it and forget it. It's not too fussy about where it grows. Deep roots = drought resistance. It's also a beautiful looking plant. The bees love it! It makes a nice mild flavored tea, very good with honey.The bruised leaves make a great poultice. I can vouch for this. Helps with burns, too. Here's some more info on comfrey;
I extended my raspberry rows and planted comfrey every 2' on the border. I will also plant comfrey along all the new rows. It doesn't impede the raspberry plant growth, as you can see. Plant it in your weed patch. Plant it anywhere. Plant it everywhere and forget needing 10-10-9999999!