Campanula With No Flowers - Knowledgebase Question

Peshtigo, WI
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Question by lmaa
January 23, 2001
I had alot of green leaves on my campanula last year but they did not flower. Why is that?


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Answer from NGA
January 23, 2001
Lots of foliage at the expense of flowers is usually due to an abundance of nitrogen. Did you fertilize with a nitrogen product? This year, scratch a phosphorous source into the soil to see if that helps.

Here?s some basic info on fertilizer and nutrients that plants require. The 3 numbers on a fertilizer bag refer to the percentage of N (nitrogen), P (phosphorous), and K (potassium) in the bag. There are different formulations for different purposes. In general terms, nitrogen produces lush green growth, phosphorous helps strengthen stems and produce flowers, and potassium keeps the root system healthy. If you're applying fertilizer to fruiting (e.g., tomatoes) or flowering plants, you're not as interested in the plant developing leaves as you are in it flowers and fruit, so you'd use a formulation lower in nitrogen and higher in phosphorous, such as Miracle-Gro's Plant Food at 15-30-15. Bone meal is an organic source of phosphorous.

Name: Jude
Pittsburgh, Pennsylvania (Zone 6a)
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A comment from obliqua
May 5, 2019
I ,too, have this issue with 'sarastro' campanula,, planted in 6 locations throughout my garden. I have had them, for three years or more and have had a few flowers in one area and no flowers in the other areas. All are planted in sunny locations. I use compost that I buy in bags as top dressing. I do not fertilize with non organic nitrogen heavy fertilizer. Only bagged leaf compost. I have used rock phosphate as a soil additive to trigger flowering. I have spreading but no flowers

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