Tithonia diversifolia, commonly known as tree marigold or Mexican sunflower, is a striking flowering plant native to Mexico and Central America. It produces vibrant yellow or orange daisy-like flowers and grows rapidly to 2-3 meters tall. Seeds are relatively easy to germinate and require light and warm temperatures.
Before sowing
Light increases germination percentage to around 70%. Seeds exhibit dormancy that requires breaking treatment.
Sowing
What to expect
Tips
Seeds require light for germination, so barely cover them with soil. Maintain consistent moisture without waterlogging. Some seeds exhibit dormancy that can be broken by humid heat treatment (80-100°C) before sowing. Germination is most consistent when seeds are harvested at optimum maturity. Substrate selection is important - avoid moisture-logged conditions such as wet jute bags. Well-draining media with good moisture retention works best (55-60% germination). Tithonia diversifolia can grow year-round in warm climates but is dormant in dry seasons.
Sources: Johnny's Selected Seeds, Plant Care Today, Plant Flower Seeds, Redalyc (scientific journal), Scielo (scientific journal), Gardeners' Network, West Coast Seeds, Garden Design, Wisconsin Horticulture Extension, Rare Exotic Seeds, Swallowtail Garden Seeds, LUCID keys, Plant World Seeds, Tropical Forages, Wikipedia, Epic Gardening, Sage's Acre, PFAF Database, Plantiary, Feedipedia
