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How to Grow Zinnia Plants: Growing zinnia plants can be inexpensive, particularly when growing them from seed. Seeds of zinnia flowers should usually be sown directly into the sunny flower bed, as developing roots do not like to be disturbed. If you wish to start growing zinnia plants from seeds indoors, plant the seeds in peat pots, poo pots (pots made from cow dung) or other biodegradable containers that can be planted directly into the garden later. Start seeds four to six weeks before the last frost date in your area. Zinnias begin to show growth outdoors when temperatures are above 50 F. (10 C). Space the seeds for growing zinnia plants properly, usually several inches to a couple of feet apart, depending on the size of the mature plant. This allows for adequate air circulation around the plants as they grow. Powdery mildew and other diseases can attack zinnia flowers that are planted too close together or that remain wet from overhead watering. While the widest range of zinnia colors and heights comes from planting seeds, the popular flower is usually available in starter packs as well at your local garden center.