Hyacinth · Maringá, Paraná, Brazil
When to sow hyacinths in Maringá
Main outdoor window
11-25 May
The window this page is built around.
Timed from last spring frost
22 July
In Maringá, on your chosen risk.
Ready to pick
29 Aug - 28 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 Maringá
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 the bulbs
11-25 May
Four to six weeks before your first frost, so roots form before the ground cools.
In flower
29 Aug - 28 Oct
Hyacinths through the year
Against the frost risk in Maringá
Why these dates
Plant four to six weeks before the first autumn frost, 12cm deep. For flowers indoors at midwinter, pot prepared bulbs in early autumn and give them ten weeks somewhere dark and around 9C before bringing them into warmth - rushing that cold period is the usual reason a forced hyacinth flowers down inside its leaves.
Hardy to about -25C in the ground. Requires roughly thirteen weeks below 9C, so it is one of the first bulbs to fail in a mild winter. The bulbs irritate skin; handle them with gloves.
Hyacinths are anchored to the first autumn frost rather than the last spring one, so the planting window on this page counts backwards from the end of the season in Maringá instead of forwards from its start.
Maringá sits in zone 10b, which is milder than this crop wants, and a winter that never really arrives is its own problem. The dates below still describe the right time of year; the open question is survival rather than timing.
The median frost-free season here is 335 days, against 150 to 200 days to first flower for this crop counted from sowing. That margin is what decides whether a late sowing is worth attempting.
Also in Maringá
Other flowers to time
Growing hyacinths in Maringá
When should I plant hyacinths in Maringá?
Aim for 11-25 May in an average year. If you would rather not gamble on the weather, wait until 4-18 May - by then frost has finished in nine years out of ten.
When will hyacinths be ready to harvest in Maringá?
Expect to start picking around 29 Aug - 28 Oct, based on 150 to 200 days to maturity from the planting date calculated for this location.
How much frost will hyacinths tolerate?
Hardy to about -25C in the ground. Requires roughly thirteen weeks below 9C, so it is one of the first bulbs to fail in a mild winter. The bulbs irritate skin; handle them with gloves.