Vegetable and Flower Seed Growing Tests

Posted by admin on May 28, 2011

We did some seed tests in various potting and seed starting mixes for both vegetables and flowers. The most interesting findings we had were that to grow seeds in containers outdoors, it is best not to use Miracle-Gro seed starting mix. Both seed starting mixes were more expensive than outdoor potting mixes. They do contain wetting agents each to retain moisture.

Above image: Miracle-Gro seed starting mix, top has thin layer of moss growing after a few weeks

Above image: Jiffy seed starting mix - plants are growing ok but not quickly, better than Miracle-Gro seed starting mix

Above image: Miracle-Gro potting soil in a regular big bag was the best

Overall, small bags of indoor seed starting mixes with a wetting agent are best to use indoors. Regular big bags of potting soil can be used to start seeds in trays or pots outside if they have nutrients, are well drained, and are sterile. It is also important to use the right brand of potting soil. We find it helpful to see a sample of the soil before buying. OSH (Orchard Supply Hardware) shows samples in clear plastic containers in the soil section, which we appreciate.