Choose firm canna rhizomes with no mushy spots, and ensure they are cream or white in color. Avoid rhizomes that are blackened or soft, as they may be rotting due to excess moisture or dehydration.
Start cannas indoors about four to six weeks before the last frost date by planting them in containers in a warm spot and watering them. This jump starts their growth, leading to earlier foliage and flowers.
Plant cannas 3 to 4 inches deep, horizontally, with the eyes at least 2 inches below ground. Planting too deep can result in stunted growth.
Opt for large containers when planting cannas to accommodate their massive root system and provide stability against wind. A wider base helps prevent tipping over in storms.
Wait until soil temperatures reach at least 50°F (60°F is better) and all danger of frost has passed before planting cannas outdoors. Use the recommended tomato planting time as a guide if you don't have a soil thermometer.
If starting cannas indoors, gradually acclimate them to outdoor conditions before transplanting. This process, known as hardening off, helps prevent transplant shock.
Ensure the eyes or buds of the canna rhizomes are facing up when planting, and plant them horizontally, not vertically.
Order cannas in winter to secure popular varieties or new releases before they sell out. Properly store rhizomes until spring for planting, either indoors for waking up or directly in the garden at the right time.