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key growing information
How to Grow Ageratum From Seed
How to grow ageratum (flossflower) from seed: germination temperature, starting seedlings indoors, spacing, sun and soil needs, and when to cut stems for fresh or dried use.
By Hensley’s Seed Co.
Ageratum - Key Growing Information
DAYS TO GERMINATION:
Expect seedlings in about 7–10 days when the mix is kept at 75–80°F (24–27°C).
SOWING:
Starting indoors is the best route. Begin 6–8 weeks ahead of your planting-out date and press the seed onto the surface without covering it, because ageratum needs light to germinate. Water from below or with a fine mist so the tiny seed is not buried. When the first true leaves show, move seedlings up into cell packs or roomier containers . Toughen them up gradually and set them out once frost is no longer a risk. Plants need neither pinching nor staking. Sowing straight into the garden usually gives poor results.
LIGHT PREFERENCE:
Full sun is best; in hot-summer areas a little afternoon shade is fine.
SOIL REQUIREMENTS:
Rich, free-draining ground with a pH between 5.0 and 6.0.
PLANT SPACING:
Set plants 9–12" apart.
HARDINESS ZONES:
Grown as an annual.
HARVEST:
For fresh bouquets, cut once about three-quarters of the flowers on a spike have opened. For drying, wait until every flower is open, then hang bunches upside down. Air drying works, though the blue tones tend to fade.
USES:
Fresh or dried arrangements, plus edging, border backs and massed bedding displays.
SCIENTIFIC NAME:
Ageratum houstonianum
ALTERNATE NAMES:
Flossflower; also sold as blue mink
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