How To Grow Sunflowers From Seeds In Australia. Sow seeds and cover with soil. Best planted at soil temperatures between 10°c and 30°c.
Moisten a paper towel slightly, so it is damp but not soaked or dripping. Sow one seed per 7.5cm pot. Gently press down on the soil and water well.
Sow seed at a depth approximately three times the diameter of the seed.
In sandy soil, 2 inches deep is better. How long do sunflowers take to grow? When first true leaves appear (the second set of leaves); Ensure the seeds remain moist during germination.