I am growing 5 different tomatoes in containers - cherokee purple, black krim, red pear, pink brandywine and sweet 100 cherry. They were all planted in the same mediums, ferts, and on the same watering schedule. All are about the same size, except for the brandywine which was a late add. All but the brandywine are blooming like crazy, but so far only the red pear and cherry are setting fruits. I started the "shaking" method today. Are black heirloom varieties slower to set fruit? I water thoroughly every other day (been hot as hades the past 2 weeks, with no rain) and although they aren't mulched, they all have water saucers under them and the soil is completely shaded by the plants. The soil never gets overly dry - they have never wilted or shown any signs of heat stress. I'm at a loss as to what is going on. I planted them with mater magic in miracle gro, and have yet to re fert as the mater magic is a 3 month slow release, and the miracle gro feeds for "up to 6 months."