Step-by-Step Growing Guide
Marigolds are among the easiest, most rewarding annuals a gardener can grow, valued both as ornamentals and as essential companion plants. Start seeds indoors 6–8 weeks before last frost or direct sow after frost. Sow 6mm deep in well-drained soil with pH 6.0–7.5; they tolerate a wide range of soil types including poor soils. Space French types (Tagetes patula) 20–30cm apart, African/American types (Tagetes erecta) 30–50cm apart. Marigolds need full sun — they perform poorly in shade. Water at the base, 2.5cm per week; once established, they tolerate short dry periods. Avoid overhead watering, which promotes botrytis. Feed sparingly — a single application of balanced fertilizer at planting is sufficient; rich soil produces lush foliage over flowers. Deadhead spent flowers consistently for continuous bloom. Plant alongside tomatoes, squash, and brassicas to repel pests with their root exudates (which suppress root-knot nematodes over time).