I’ve grown white and blue agastache from seeds, they were fine until last winter when it was particularly cold and they all died, also, they are slug magnets. I’ve got Salvia Black and Blue, very similar to Amistad but much more hardy. Survives every winter.
Gardening on the wild, windy west side of Dartmoor.
I grew Salvia Magic Burgandy for the first time last summer in a pot so not sure how it will behave in the ground when planted out this year, love the colour of the flowers and the bees loved it.
I have most of the ones mentioned above, and most do well here in the dry sandy soil. For a good purple, my vote is Mirage Deep Purple. Larger flowers and less dull than Nachtvlinder, and it doesn't sucker around like Nachtvlinder does (that might be a good or bad thing depending on how much space you want to fill). Christine Yeo is a lighter, brighter purple but it's a weaker grower than most for me, so perhaps that's just its nature.
Mirage Cherry Red is also good, a more blue-crimsom red than Royal Bumble which to my eye is scarlet edging towards the orange side of red. For a deeper raspberry-red, there's Raspberry Royale.
Blue Note is the deepest blue I have, but the flowers are quite small. Lavender Dilly Dilly has larger flowers, more of a lavender-mauve blue, and the plants get larger too, to about a metre height and spread from a hard spring pruning. Blue merced is a lovely clear light blue, with (to my eye) just a tiny hint of lilac in it.
Doncaster, South Yorkshire. Soil type: sandy, well-drained
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I’ve got Salvia Black and Blue, very similar to Amistad but much more hardy. Survives every winter.
Black and Blue Salvia