Well, it's seed picking time, and pretty soon it will be time to start those seeds in the greenhouse.

Tomatoes in west Tennessee, where I live, seem year after year to be hit with a blight that begins at the base of the plant and moves upward, turning leaves and stems brown as it moves up. The initial crop seems to make it because it seems to be one step ahead of the stem and foliage browning, but it does lead to premature death of the plant.

I am an organic gardener.

I already know about simple preventative measures, like planting the tomatoes in healthy soil, cleaning my tools regularly with bleach/water, careful watering of the plants so as not to allow garden soil to splash the plant, making sure plants are not so close together that air cannot flow freely, etc.

But what else can an organic gardener do to try and prevent the blight from taking over the plant?