Growing Guide
1-2cm
100cm
100cm
50-100cm2
5cm
Directly sown
5-10
80-120
Before you plant, mix some compost into the soil.
Sow sunflower seeds about one knuckle deep, approximately three times the diameter of the seed (1-2cm).
Sunflowers look stunning when planted en masse, another reason to sow them directly, plus it saves you the tedious task of transplanting them all.
Space seeds about 10cm apart in a shallow trench between 1 and 2 cm deep.
In sandy soil, 2cm deep is better.
Cover and keep watered until seeds sprout in 7 to 10 days.
When the first true leaves appear (the second set of leaves); thin plants to about 60-100 cm apart.
Depending on the variety, sunflowers will mature and develop seeds in 80 to 120 days.
Sow a new row every 2 to 3 weeks to enjoy continuous blooms until the first frost.
It is best to direct sow sunflower seeds.
Although sunflowers can be started indoors in individual peat pots, it is easiest to sow seeds directly into the soil after all danger of spring frost is past
In the early fall, check flower heads for signs of maturity.
The reverse side turns from green to yellow-brown.
Large heads will nod downward.
A close look will reveal the tiny petals covering the developing seeds have dried and now fall out easily exposing the tightly packed mature seeds.
In the early fall, check flower heads for signs of maturity.
The reverse side turns from green to yellow-brown.
Large heads will nod downward, and tightly packed seeds will be within the center of the sunflower.
To harvest the seeds ahead of the birds and squirrels, cut off the seed heads with a foot or so of stem attached and hang them in a warm, dry place that is well-ventilated and protected from rodents and bugs.
Keep the harvested seed heads out of humidity to prevent spoilage from molds and let them cure for several weeks.
When the seeds are thoroughly dried dislodge them by rubbing two heads together, or by brushing them with your fingers or a stiff brush.
Allow the seeds to dry for a few more days then store in airtight glass jars in the refrigerator to retain flavor.
Zone 1 - Cool
October , November , December
Zone 2 - Temperate
January , August , September , October , November , December
Zone 3 - Subtropical
January , February , March , April , August , September , October , November , December
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