Days to Germination:5-10 days
Tithonia rotundifolia. Mexican Sunflower can be direct-sown into the garden or started indoors 6 to 8 weeks before transplanting out after the threat of frost has passed. Prepare bed in full sunlight with rich, well-draining soil. Sow seeds in good seedstarting medium at 70°F with even moisture, strong light and good ventilation. For consistent moisture during germination, cover flats or pots with plastic wrap until seedlings emerge: then discard plastic. Harden off seedlings by gradually acclimating them to outside conditions for 1 to 2 weeks before transplanting out. Thin or transplant the seedlings 24" apart. Drought-tolerant, this heat-lover requires good drainage and dislikes excessive watering. This imperious scarlet-orange beauty may need staking. A terrific cut flower, cut ends must be flame-seared to prevent wilting. Summer flowering. Height: 36" to 48".