This year I removed the plants from the pots and it seems that the roots are only a fraction the size of the pots - about 6-8" diameter- suggesting that there are still lots of nutrients in the old soil.
Last year I bought all the potting soil and now I'm preparing to plant again and wondering if some of the old soil could be re-used this year with the new potting soil. Has anyone tried this before?
I now have a batch of 10 - week-old seedlings ready for transplanting. The previous plants had no diseases and the only bothersome things were whitefiles and white butterflies. I live in north California.