When to Grow Cannas in Central Texas?

Planting From Rhizomes

• Cannas grow from rhizomes, or fibrous roots. Plant rhizomes in early spring after the last danger of frost. According to the National Weather Service, Central Texas late-freeze dates average between March 1 and 22. Rhizomes should be planted 3 inches in the soil, eyes up, and spaced 1 to 4 feet apart. Be sure they receive enough water as they begin to grow.

Planting From Seed

• Although starting cannas from seeds is less successful than using rhizomes, it is possible. Nick the seeds and soak them overnight in warm water to facilitate germination, which takes one to two weeks. When starting seeds, germinate them indoors in January, six to eight weeks before the average late frost in spring and then plant them outside after danger of last frost. From sowing to flower on average takes between 90 and 100 days.

Finding Adult Plants

• Varieties of fully grown cannas are easy to find in local garden centers and nurseries. If you are buying an adult plant, the best time to choose one from a local garden center is early in the spring before they have been subjected to hot temperatures. Ideal planting time for adult plants is in the early spring after the last frost and long before temperatures spike -- usually late March or early April in Central Texas. These plants flower well into September before starting to wane.

Water Issues

• Central Texas is prone to drought even before summer hits. Although cannas can handle dry garden conditions, when they are first being established, they are not quite as tough. If possible, plant them soon after a local rain so that the soil isn't parched or cracked. Pay close attention to water needs, especially as the roots are being established. For best results, provide a mix of compost with the soil so that moisture is retained, and water the plants freely in the summer when there is less rain.