I have a large border that contains a big area of annual sunflowers. In the past 5 years the flowers have become shriveled and do not open fully. They also grow far too high and I am five foot and they are easily a foot taller at their peak. I have 2 questions: 1. Can I stunt their growth a bit? 2. How do I get the flowers to bloom as they did? The border was well established before I bought the house and there are far too many to dig up!!
Sunflower Too Tall
Certified GKH Gardening Expert
Are they getting full sun and enough water (they need lots of water)? They are also heavy feeders. I would amend the soil with either compost, well-composted manure or fertilizer. I bet over time the sunflowers have depleted the nutrients from the soil they are growing in.
There really is no way to stunt the growth of a sunflower. You may want to consider pursuing sunflowers of a shorter variety.
Here is an article on sunflower problems that may interest you:
And some articles on sunflower care:
For more information on perennial sunflowers, please visit the following link: