56-63 days. Durango Series French marigold seeds are an adorable, compact, and vibrant addition to grow in any home or garden. Durango Series seeds grow hardy 10-12" bushy marigold mounds tidy enough for indoor gardening, yet robust enough to keep outside during the long summer months. Durango Series marigold seeds promise dazzling 2" anenome-like heads atop robust stalks certain to excite any garden, fresh cut arrangement, or bouquet. Durango Series marigolds are durable and easy to grow from seed, ideal for indoor containers and pots or for a charming border around the flower bed or walkway. Coated Seeds.