Crop Rotation Group
Miscellaneous
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Soil
Fertile, well-drained soil.
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Position
Full sun to partial shade.
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Frost tolerant
None. Ageratum cannot tolerate cold temperatures.
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Feeding
Mix a light application of a balanced organic fertilizer into the soil prior to planting. In midsummer, drench plants with a liquid plant food to stimulate new growth.
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Companions
Dwarf types make good edging plants for beds and containers. Tall varieties often are grown as cut flowers.
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Spacing
Single Plants: 7" (20cm) each way (minimum)
Rows: 7" (20cm) with 11" (30cm) row gap (minimum)
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Sow and Plant
Sow tiny ageratum seeds atop moist seed starting mix and gently press them into the surface. Most gardeners buy ageratum seedlings, but only dwarf varieties are widely available as bedding plants. Space dwarf varieties 8 inches (20cm) apart in all directions; allow 12 inches (30cm) between very tall varieties.
Our Garden Planning Tool can produce a personalized calendar of when to sow, plant and harvest for your area.
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Notes
Blue ageratum provides excellent contrast when combined with flowers with orange blossoms. Some varieties produce white or pink blossoms.
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Harvesting
Snip off spent blossoms to keep plants looking neat, and to prolong flowering. Tall varieties make great cut flowers.
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Troubleshooting
White ageratum blossoms go brown as they age, which is not as noticeable in varieties that bloom blue.
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