1-gallon (trade gallon) or about that size nursery pots. I prefer injection-molded pots or thermoformed/co-extruded/euro pots, but I could also use the old standard blow-mold type pots if they are in good condition (they deteriorate more quickly in sunlight, when left out).

Are these the black plastic pots that plants come in at like Home Depot and Lowes? I have a ton in my shed. I can see what I have. Do they have a normal measurement? I don’t want to bring you something too small.

Jacie

A typical trade-gallon thermoformed pot (the thin walled pots that are sometimes colored black inside but green or brown on the outside) measures 6.25"(top) x 5.75"(bottom) x 6.25"(height). Even though they are thin, these usually last a long time.

Trade-gallon injection-molded pots (thick, usually smooth walled) vary quite a bit but would sometimes come with about the same measurements as the thermoformed pots. These are the premium type of pot and last a very long time.

A typical trade-gallon blow-mold pot (the ones that frequently have kind of scalloped shape side) measures 6.5"(top) x 5"(bottom) x 6.5"(height). These are the fairly cheap, common pots a lot of woody plants come in from nurseries. Their rims often start to break down within a year or two. Once the rim is gone, the whole pot becomes flimsy and often starts to fall apart.

Full-gallon (as opposed to trade-gallon) pots would measure a little larger.