Cauliflower belongs to the cabbage family. Like other family members cauliflower relies on soil which is rich in nitrogen. Make sure to mix organic matter and compost with the soil which will provide nitrogen and additional nutrients to the plant. Plant the seeds 4-6 weeks before the last frost. The seeds needs to be planted 1/4 to 1/2 deep. Make sure that the seeds are moist and not overwatered. Make sure that the plants are harden before gradually transplanting them to the garden. Set the seedlings at least 18-25 inches apart. Make sure you give enough water to the seedlings.