Answer: Agapanthus are members of the lily family and will form clumps when they become established. When mature they will grow from 1 1/2 to 3 feet tall. You can plant up to three clumps in your planter, but expect to remove a couple of them when they begin to mature, or the plants will be overcrowded. You can expect blooms the first year, but a spectacular showing might take an additional season. Agapanthus are reliable plants and can have 20-50 flowers per cluster once they're established.
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