Growing Plants From Seed For Summer Pots & Containers Learning with Experts How and When to Plant Zinnia Seeds for Flowers All Summer Jiffy Square Peat Pot Handling Sheet: 3 x 3 Pots, Peat Pots: J.W. Jung Seed Company Tomato Fertilizing Guide From Seedling to the End Of the Season One of the most common questions I get is how much and how often to fertilize tomatoes. Tomatoes are heavy feeders, so consistent feeding makes a big difference in growth and yield.