Sneezeweed
Helenium
An ornamental plant, planted March to May or September to October, or sown January to July.
In September: lift and divide the sneezeweed. It can be planted out now.
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Sneezeweed, month by month
Bar: the usual months. Sprout: this month.
| Sowing, planting or job | Sep | Oct | Nov | Dec | 2027Jan | Feb | Mar | Apr | May | Jun | Jul | Aug |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sow under cover. | none | none | none | none | usual | usual | usual | usual | none | none | none | none |
| Sow outdoors. | none | none | none | none | none | none | none | none | usual | usual | usual | none |
| Plant out. | usual | usual | none | none | none | none | none | none | none | none | none | none |
| Plant a pot-grown sneezeweed. | none | none | none | none | none | none | usual | usual | usual | none | none | none |
| Lift and divide the sneezeweed. | usual | usual | usual | none | none | none | usual | usual | usual | none | none | none |
| Stake the sneezeweed. | none | none | none | none | none | none | usual | usual | usual | none | none | none |
| Cut the sneezeweed stems back by a third to a half. | none | none | none | none | none | none | none | none | usual | usual | none | none |
| Deadhead the sneezeweed. | none | none | none | none | none | none | none | none | none | none | none | usual |
What to do, and when
The usual months for a UK garden. Your own plan gives the week.
Sowing and planting
Sow under cover January to April, 2 to 3mm deep. Moderate sources: Mr Fothergill’s and Unwins.
Sow outdoors May to July, 30cm apart, rows 30cm apart. Moderate source: Mr Fothergill’s.
Plant out September to October, 45cm apart. Moderate source: Mr Fothergill’s.
Plant a pot-grown sneezeweed March to May, 50cm apart. Moderate sources: J Parker’s and Mr Fothergill’s.
Lift and divide the sneezeweed
Every 3 years, not every year.
Usually March to May, and September to November. Moderate source: Gardeners’ World.
Stake the sneezeweed
Put stakes in around the whole clump.
Usually March to May. Strong source: RHS.
Cut the sneezeweed stems back by a third to a half
Gardeners call this the Chelsea chop.
Usually May to June. Strong sources: RHS and Gardeners’ World.
Deadhead the sneezeweed
Usually August. Moderate source: Sarah Raven.
What the source words mean
Strong: the RHS page for this plant is among them.Moderate: another trusted UK source, or the RHS on its group.
Every line above names the page it comes from. Where we found no good source for a job, we left it out. Where the name “Sneezeweed” comes from.