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Calculating the number of plants

I want to add some Erigeron Karvinskianus to a set of old flint steps (10 steps in total), how do I calculate how many plants I need to create a good display? Many thanks. 


  • FairygirlFairygirl Posts: 54,023
    What are the dimensions of the steps?
    How are you planting them? In pots? In cracks?
    If it's the last option, do you want the steps covered, or just a random look?
    It's a place where beautiful isn't enough of a word....

    I live in west central Scotland - not where that photo is...
  • JennyJJennyJ Posts: 9,644
    If you just put one near the top it'll have seeded itself all over within a few years.
    Doncaster, South Yorkshire. Soil type: sandy, well-drained
  • The height and spread of each plant may help you gauge the number but as @Fairygirl says, it will also depend on how you intend to plant them.
  • In the cracks of the steps and a random look. I will check the dimensions of the steps and the spread of the plant. 
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