Indoor Gardening and Houseplants: Clay in house plant soil, 1 by Zen_Man

Zen_Man wrote:
Hi Mike,

I have no idea what happens if you leave the plants in ProMix (or anything else) for five years. I grow only annuals in pots. Primarily zinnias and tomatoes. And some of them get set in the garden after a month or so.

\" ...and how long can it go unfertilized? \"

ProMix contains only a very small amount of nutrients, enough to support new seedlings for only a few days. I water it with soluble nutrients, including some Calcium nitrate.

I breed zinnias as a hobby, and I can grow zinnias indoors under lights from seed to home hybridized seed in ProMix. I use a complete formula of soluble nutrients in the water I use. I can grow two generations of zinnias indoors during the Winter (in ProMix). In addition to another two generations outdoors (in garden soil). That lets me breed new zinnias that are not available commercially.

ZM