West Coast Seeds
West Coast Seeds (Giganteus)
West Coast Seeds (Giganteus)
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Helianthus annuus. Inconspicuous Giganteus sunflower seeds produce absolutely huge plants in one short season. This is the giant among sunflowers, with towering stems up to 3.6m (12') tall, as thick as a man's leg. At the top grows a monumental flower, with the seed head growing 25-35cm (10-14") across, heavy with edible seeds. The seed heads tend to nod forward at maturity, facing down. Be sure to get the seeds planted early so the seed heads can mature before the wet weather arrives in September. It's a good idea to direct sow (as opposed to transplanting) these enormous plants so their root growth is not interrupted. They need a solid anchor in order to keep them standing upright.
| Latin |
Helianthus annuus |
| Difficulty | Easy |
| Exposure | Full sun |
| Timing |
Direct sow repeatedly after the last frost date. Starting indoors is possible, but does not gain much time. If sunflowers are allowed to get root-bound, they will lack stability at transplant time, and will require staking. Optimal soil temperature for germination: 21-30°C (70-85°F). Seeds should sprout in 10-14 days. |
| Starting |
Sow seeds 5mm-1cm (¼-½”) deep. Space dwarf varieties 15cm (6″) apart, but give the giants lots of room at 1m (3′) between plants. |
| Growing |
To grow really big plants with really big flowers, enrich the soil with organic matter and incorporate 2 cups of balanced organic fertilizer per 3m (10′) of row, and irrigate regularly. When the plants are 30cm (12) tall, dissolve 5ml (1 tsp) of borax (for boron) in 350 ml (12 fl oz) of water and spread the solution over 5m (15′) of row. Be careful not to over-apply this solution. This application of boron will produce bigger seeds and flower heads. Do not apply boron to other garden plants. When the back of the flower head turns yellow, it is ready to be cut from the plant. |
