Depends on what you like really. Perennials which like the same conditions - Veronicas, Salvias, heleniums etc, are good with them, and so are lilies, but it also depends on how much room you have, and whether you want a long display. Grasses are good with them too.
It's a place where beautiful isn't enough of a word....
I live in west central Scotland - not where that photo is...
I have issues with Alliums I have hundreds planted in a lovely loam amended south facing border. I had a grand total of 10 pop up. They are all planted deep 8-10 inches I dug a new rose in last week, to a depth of about a foot in depth. I found dozens and dozens of allium bulbs. Could it be the case that the border is too hot/dry and the bulbs are multiplying as opposed to flowering?
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I live in west central Scotland - not where that photo is...
When you don't even know who's in the team
S.Yorkshire/Derbyshire border
I dug a new rose in last week, to a depth of about a foot in depth. I found dozens and dozens of allium bulbs. Could it be the case that the border is too hot/dry and the bulbs are multiplying as opposed to flowering?