Potting-up / re-pot / transplant to larger container?
I have zucchini, haogen melon, and rosa bianca eggplant in containers on my roof. Everything is doing really well so far, but I am worried that the containers are too small. I used these "Plant Spas," from the Dollar Store (http://www.backyardstyle.com/shop/index.php?page=shop-flypage-44350) the 12" size. Are these too small? I am trying to be very precise about watering and feeding the plants but if it turns out that the containers are too small, is there any way I can "Pot Up" or transplant my mature healthy plants to a larger container? I have had very bad luck doing this with house plants in the past.
Thank you very much!