Answer: When planting in a container, I personally try to get a massed look...so I tend to put plants closer together and more of them. In the case of vines, most of the plant will spill out of the container so I would plant probably 5 plants in a 12 inch pot.It also depends on the size of the leaf. Smaller leaves would mean more plants while larger leaves less plants. I think the same goes for in ground planting. One other thing to remember is that the closer you plant the more competition there is between plants for root space, water and fertilizer. So you have to make a decision...do you want a massed look and don't worry about competition or do you want specimen plants that have not had to compete. To be specific, plant them 6-12 inches apart of a massed look and 12 or more inches for specimen plants. Tomatoes need BIG containers. Dwarf ones need at least 1 gallon pots while standard tomatoes need 2-3 gallon pots! If you plant liatris and dahlias they would bloom mid-summer.
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