For transplanting up to bigger pots, I had very good success last year with Sunshine Organic Blend (went through 26 bales total, if I recall), some Sustane 4-6-4 slow release organic fertilizer and a little bone meal. Worm castings would be an excellent addition to this mix.
I used 16-oz. plastic Solo cups for years because they were so cheap. I even washed and reused them. But now that I've started a little business (1 year anniversary last week!), I won't use those cups again. They just fall over too easily, especially when I'm trying to load up a small box for customers.
I've given in and gone with the high quality 3-1/2 in., 18 pots per 10-20 tray. I give customers a 10˘ return/credit on these pots. I just washed and reused dozens of them today which were returned last year. I'm guessing these could last for several years if cared for properly.
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