Garden phlox · Queens, New York, United States
When to sow garden phlox in Queens
Main outdoor window
12 Apr - 10 May
The window this page is built around.
Timed from last spring frost
29 March
In Queens, on your chosen risk.
Ready to pick
1 Jul - 30 Sep
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 Queens
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 Jul - 30 Sep
Garden phlox through the year
Against the frost risk in Queens
Why these dates
Plant out in spring after the last frost, or in autumn. Thin each clump to five or six stems in spring: crowded growth is what triggers the mildew, and a thinned plant flowers just as well. Divide every three years.
Hardy to -30C and fully dormant in winter. Needs a cold season to perform and is unsatisfactory in frost-free climates.
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. Garden phlox are timed with planting out 2 weeks after it, and this page simply resolves those offsets against the frost date computed for Queens.
Hardiness is not the obstacle here. Queens 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 Queens
Other flowers to time
Growing garden phlox in Queens
When should I plant garden phlox in Queens?
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 garden phlox be ready to harvest in Queens?
Expect to start picking around 1 Jul - 30 Sep, based on 120 to 150 days to maturity from the planting date calculated for this location.
How much frost will garden phlox tolerate?
Hardy to -30C and fully dormant in winter. Needs a cold season to perform and is unsatisfactory in frost-free climates.