10 Luffa Angled Seeds (Extra Long) Edible Luffa,chinese Okra,1 Pound / 33" Long. Requires a long, warm growing season. Prepare fertile, well drained soil. Sow seeds in spring/early summer after last frost in a warm, sunny location. The seed coat is hard and should be soaked in warm water for 24 hours or lightly scarified before sowing. Hill planting: Form soil into a 1-ft. diameter mound 3-4' tall. Space mounds 4-6' apart. On each mound plant 1-2 seeds. Row planting: See spacing info in chart. Keep soil moist. Fertilize as needed. Hand pollination may be necessary. Train to climb a vertical support for better air circulation, straighter fruit and ease of harvest. To process for luffa sponges, allow gourds to hang on the vine until they are fully mature and the skin hardens/dries. Remove skin and seeds.