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Annuals/Perennials > Flowers
After about a month and a half, my cosmos are huge but don't have any blossoms. I read that they don't bloom in over fertilised soil. Is there any way to 'UN-fertilise' my soil?
Yes that is correct. Cosmos will not flower in over fertile soil. My feeling is that your nitrate levels are too high. It may be a good idea to try to take them out and plant something else in that spot. Alternatively after you have taken them out you could try mixing a quantity of washed river sand thru the soil in equal parts. 1 part soil to 1 part sand. This will change the existing structure of the soil and lower the available nutrients.
Hi, our cosmos is taking off in an uncontrolled manner, from the garden bed underneath concrete, coming up through cracks and edges of the driveway and into our lawn/grass area. Any tips on how to control the spread?
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