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The type of shade impacts the health and flowering of the canna. They may grow poorly in deep shade. Cannas grown in light shade receive partial sunlight and bright shade, which may not impact them greatly. Dappled shade allows some sun to reach the cannas.
The soil should also be rich in organic matter. When growing cannas in the garden, placing them in mixed borders or group plantings will offer the most dramatic effect. How to Plant Canna Lilies. Cannas can be planted outdoors in warm climates or containers in other areas. During spring, when planting of canna lily plant, wait until the threat of frost has passed. Groups of cannas should be planted about a foot or two apart. While technically they donât have a top or bottom, most canna rhizomes can be planted horizontally with the eyes facing up. Cover the rhizomes with 3 to 6 inches of soil. Water well and apply a layer of mulch to retain moisture. Canna Lily Care. Once established, cannas need to be kept moist.