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Agapanthus africanus can be grown within USDA plant hardiness zones 9 to 11. In lower-numbered zones, the bulbs should be placed deeper in the soil and mulched well in the fall. Agapanthus can be propagated by dividing the bulbs or by seeds. The seeds of most varieties are fertile. In some regions, some agapanthus are listed as invasive species of plants. In New Zealand Agapanthus praecox is classed as an "environmental weed" and calls to have it added to the National Pest Plant Accord have encountered opposition from gardeners. Agapanthus has low potential for causing allergies; its OPALS allergy scale rating is 2 out of 10. Which family the genus belongs to has been a matter of debate since its creation. In the Cronquist system, the genus was placed in a very broadly defined family Liliaceae, along with other lilioid monocots. In 1985, Dahlgren, Clifford, and Yeo placed Agapanthus in Alliaceae, close to Tulbaghia.Their version of Alliaceae also included several genera that would later be transferred to Themidaceae.