Choice/how many Heuchera for a border ?

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We have a half moon shaped borders in a sunny spot in our garden, a quarter of which contains Dark Red Heucheras. I need to add some more to complete the border.
The area i have available is approx 1.5 meters by 1.0 to 1.25meters and am thinking of two extra colours to add in. What would you recommend, please and how many would i need

Hi Geoff
Thanks for your enquiry
We think you would need about 10 plants as a guide.

The varieties that we think would be nice are Heuchera forever purple
Heuchera Tangerine wave and or Heuchera sugar plum, but you might fancy somthing else 🙂
Hope this helps
Kind regards

Heuchera ‘Forever Purple’ PBR (SKU18201)

Vicky and Richard Fox