Growing Blue Horizon Ageratum Flower Garden Seeds
- Taxonomy: Ageratum houstonianum
- Other Names: Mexican Paintbrush, Flossflower, Bluemink, Blueweed
- Seed Type: Annual
- Sow Indoors or Outdoors: Blue Horizon Ageratum flower seeds are best started indoors 8 – 10 weeks prior to the final frost, with germination occurring in 7 – 21 days with full lighting. Ageratum flower seeds sown directly after the frost will exhibit a shorter blooming period. Taller varieties may need early staking.
- Days to Plant Maturity: 77 – 91 days
- Hardiness Zone: 4 – 9
- Seed Planting Depth: Lightly press without covering 3 – 4 seeds
- Plant Spacing: 6 – 9"
- Growth Habit: 18 – 32" tall shrubby upright with a 12 – 18" spread of dozens of unique globular flower blooms
- Soil Preference: Organically rich, consistently moist, well-drained
- Light Preference: Full sun – Partial shade
- Diseases/Pests/Troubleshooting: Blue Horizon Ageratum seeds are not tolerant to drought and requires consistently moist soils and is susceptible to powdery mildew and root rot if poorly drained. Avoid overhead watering to minimize saturation of foliage. Plants will benefit from afternoon shade in regions with excessive summer heat. Watch for aphids and white flies.
- Flower Color: Bright lavender blooms with deep purple centers
Ageratum houstonianum, or sometimes called Mexican Paintbrush, is a flower native to Guatemala, Belize, and intermittently throughout Mexico, but has since naturalized to similar tropical regions in surrounding countries. Ageratum houstonianum is known to be toxic to grazing animals and, if grown beyond its natural habitat, may spread invasively. The genus Ageratum is loosely translated from Greek meaning "does not age" in reference to the long-lasting color well into the season.
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