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How to Grow Snapdragon Plants:Snapdragon plants grows best in full sun. They will grow well in average soil. Soil should be well draining.Add a general purpose fertilizer before planting if the soil is poor.Plant Snap Dragons outdoors after the last frost for your area. Fertilize once a month. Flowers will bloom in June. After the flowers have died off, cut the plant back to about six inches. Then add some general purpose fertilizer. This will promote new growth and a second bloom.Snapdragons are very hardy. They can withstand a heavy frost. So, if your plant is still blooming in the fall, do not be too quick to clean up the flower garden.Propagation: Grow snapdragon flowers from seed. Snapdragon germination can take up to three weeks, so start seeds indoors about two months before the last expected frost. Two months after the snapdragon seeds sprout, transplant the strongest seedlings into plant containers outdoors. Don’t transplant any snapdragon flowers that already have buds – these most likely will not survive the transplant.