Bishop's flower · Brussels, Brussels Capital, Belgium
When to sow bishop's flowers in Brussels
Main outdoor window
23 Mar - 20 Apr
The window this page is built around.
Timed from last spring frost
13 April
In Brussels, on your chosen risk.
Ready to pick
1-31 Jul
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 Brussels
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.
Start indoors
16 Feb - 16 Mar
Eight weeks before your last frost, under cover or on a windowsill.
Sow direct
23 Mar - 20 Apr
Three weeks before your last frost.
Plant out
30 Mar - 27 Apr
Two weeks before your last frost.
In flower
1-31 Jul
Bishop's flowers through the year
Against the frost risk in Brussels
Why these dates
Sow direct three weeks before the last frost, or start indoors eight weeks before it in modules - it moves reasonably well when small, unlike most umbellifers. Support a stand with a single row of netting; at 1.2m it goes over in wind. An autumn sowing gives the strongest stems.
Hardy to about -12C as a young plant, which makes it one of the most reliable hardy annuals for autumn sowing in zone 7 and milder. Tolerates heat better than most of this group.
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. Bishop's flowers are timed from 8 weeks before that frost for an indoor start, with planting out 2 weeks before it, and this page simply resolves those offsets against the frost date computed for Brussels.
Hardiness is not the obstacle here. Brussels is zone 8b, comfortably inside the range this crop is rated for, so an established plant should come through an average winter without protection.
The median frost-free season here is 216 days, against 100 to 130 days to first flower for this crop counted from sowing. That margin is what decides whether a late sowing is worth attempting.
Also in Brussels
Other flowers to time
Growing bishop's flowers in Brussels
When should I plant bishop's flowers in Brussels?
Aim for 23 Mar - 20 Apr in an average year. If you would rather not gamble on the weather, wait until 2-30 Apr - by then frost has finished in nine years out of ten.
When will bishop's flowers be ready to harvest in Brussels?
Expect to start picking around 1-31 Jul, based on 100 to 130 days to maturity from the planting date calculated for this location.
How much frost will bishop's flowers tolerate?
Hardy to about -12C as a young plant, which makes it one of the most reliable hardy annuals for autumn sowing in zone 7 and milder. Tolerates heat better than most of this group.