Michaelmas daisy · Brooklyn, New York, United States
When to sow michaelmas daisies in Brooklyn
Main outdoor window
12 Apr - 10 May
The window this page is built around.
Timed from last spring frost
29 March
In Brooklyn, on your chosen risk.
Ready to pick
1 Sep - 31 Oct
If you plant at the start of the window.
The average last frost. Half of all years are later than this.
Step by step in Brooklyn
Each window is a range, not a single day. Earlier in the range buys you a longer season; later in it buys you a safer one.
Plant out
12 Apr - 10 May
Two weeks after your last frost.
In flower
1 Sep - 31 Oct
Michaelmas daisies through the year
Against the frost risk in Brooklyn
Why these dates
Plant out in spring. Pinch the shoots back by a third in early summer to keep a 1.2m plant self-supporting rather than staked. Divide every two or three years, because clumps run outward and die out in the middle.
Hardy to -30C. Mildew in a dry summer is the usual complaint, not winter damage; keeping the roots moist prevents most of it.
Seed packets and extension guides express timing as weeks either side of the last spring frost, because that is the only reference point that travels. Michaelmas daisies are timed with planting out 2 weeks after it, and this page simply resolves those offsets against the frost date computed for Brooklyn.
Hardiness is not the obstacle here. Brooklyn is zone 8a, comfortably inside the range this crop is rated for, so an established plant should come through an average winter without protection.
Do not expect a crop in the first year. A plant set out now should give its first worthwhile pick around year 1, and will then produce every year after that, which is what makes the planting decision worth getting right the first time.
Also in Brooklyn
Other flowers to time
Growing michaelmas daisies in Brooklyn
When should I plant michaelmas daisies in Brooklyn?
Aim for 12 Apr - 10 May in an average year. If you would rather not gamble on the weather, wait until 22 Apr - 20 May - by then frost has finished in nine years out of ten.
When will michaelmas daisies be ready to harvest in Brooklyn?
Expect to start picking around 1 Sep - 31 Oct, based on 140 to 170 days to maturity from the planting date calculated for this location.
How much frost will michaelmas daisies tolerate?
Hardy to -30C. Mildew in a dry summer is the usual complaint, not winter damage; keeping the roots moist prevents most of it.