|Double Quick Orange|
Single Stem or Branching
Sunflower varieties for cut flowers are grouped as single stem or branching. Single stem flowers produce one flower per plant. Once the flower is harvested, the plant can be pulled out because it will not re-bloom. Branching sunflowers produce multiple flowers, and a single plant produces flowers for a longer season. I initially thought the branching kinds sounded better, and if you were only going to have one or two plants in your vegetable garden that might be true. However, I had trouble with short stems and unpredictable flower size with the branched varieties and eventually just grew the single stem kinds.
All the true reds and true oranges are branching varieties. Although some single stem varieties are advertised as orange or red, I thought the orange ones were more gold and the reds had a yellow overlay which the branching kinds do not.
In the garden, bees constantly collect the pollen from sunflowers so you never see it. However, if you cut a sunflower and bring it inside, the pollen quickly appears on the disk and will litter wherever you set the cut flower. To avoid this, you can grow pollenless hybrid sunflowers. These typically will say “pollenless” or “F1”. There are now dozens of these on the market. Here are some well known kinds.
|Pro Cut Series||Single||50-60||yellow, gold, pale yellow|
|Moulin Rouge||Branching||65-80||deep red|
|Double Quick Orange||Single||65||more gold than orange, but a pretty double|
|Buttercream||Branching||50-60||Very pale yellow to white|
|Sunrich||Single||60-70||lemon, gold and orange|
You can buy these varieties and many more at Johnny's and GeoSeed.
If you are growing single stem varieties for cut flowers, you need to succession sow several times or all your sunflowers will bloom at once. You can also choose several varieties with different maturities. When I was growing cut flowers commercially, I sowed sunflowers eight different times from the beginning of May until the beginning of October. I used different maturities at each sowing to ensure I had a continuous supply of sunflowers.
Direct Sow vs Transplant
Most people direct sow sunflowers but I had better luck starting them in liners and then transplanting them when they were about 3 weeks old. The bad luck with direct sowing was mostly because I was sowing the seeds in a very large garden and could not keep the soil consistently watered. I also may have suffered from birds or rodents eating the newly emerged seedlings. The method I used was to fill 6 pack liners with grow mix, wet the soil, and then put one seed in each cell about ½ an inch deep. The seeds usually emerged in about a week. When they were about 3 weeks old I would transplant them to the garden. If you wait too long to transplant the sunflowers, the plants will bolt and bloom on undersized plants.