Tithonia are half hardy annuals that range from 60 cm to 1.2 m in height (2 to 4 feet).
They bloom from summer through to autumn. Their flowers are reminiscent of sunflowers. These flowers may be yellow, orange, or red.
Some common names for Tithonia plants include Mexican Sunflower, and Golden flower of the Incas.
Common Names: Mexican Sunflower, Tree Marigold, Mexican Tournesol.
Life Cycle: Half hardy annual. Hardy perennial.
Height: 24 to 100 inches (60 to 250 cm).
Native: Central and Northern America.
Growing Region: Zones 3 to 10.
When growing Mexican Sunflower and other Tithonia plants, it is best to start them off indoors unless you live in a very warm area.
Start off about 7 or 8 weeks before you expect the last frost of winter / spring.
The Mexican sunflower seeds should be sown on the soil surface, and will take from half to two weeks to germinate at a temperature of about 20 degrees centigrade (68°F).
The young Mexican sunflower seedlings should be transplanted outdoors following the last frost of spring. Use a spacing of around 60 cm apart (2 feet). Tithonia species should be grown in sunny areas of the garden. and prefer a light soil.
It is quite easy to care for Mexican Sunflowers and other Tithonia plants. They are quite tall so provide them with a stake. As they like hot dry areas, only provide with water during drought.
As Mexican sunflowers are annuals they should be grown from seed. So do not take cuttings or divide the plants for purposes of propagation.