I had the same question about density so thanks for posting this.
I also want to know how far they actually “cascade” - I intend to plant just begonias. They are from wilko and it says they grow to a height of 20cm. I’m assuming you’d need to plant a trailer /spiller with the begonia otherwise the hanging basket will still show.
Depending on the variety and size of the tuber it will vary. Personally, for me I think it’s lovely to see a nice rattan or wrought iron type of basket showing but I don’t like those coloured plastic types.
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I also want to know how far they actually “cascade” - I intend to plant just begonias. They are from wilko and it says they grow to a height of 20cm. I’m assuming you’d need to plant a trailer /spiller with the begonia otherwise the hanging basket will still show.