The mature spread of Sea Breeze seems to be about 18 inches (various Google hits say slightly different things so it probably depends on conditions) so plant them about that far apart or a bit further if you want them to make individual mounds, or a bit closer if you want them to merge together. If they get too big/too close you can always take one out later.
Your plug plants would be better potted up and grown on with some protection
for a while before planting out. Even though they are hardy plants
they've probably been raised under cover on the nursery and going
straight out in the open would be a shock to them. It's still getting
chilly at nights.
Doncaster, South Yorkshire. Soil type: sandy, well-drained
I agree with Jenny. At the end of this year I would expect the plug plants to have spread about 10” and the full spread achieved in year 2. They’re hardy but poorly drained frozen soil might wipe a few out. I lost about 10% of mine.
You asked about Sea Breeze. I think it is a more ‘clumpy’ plant with statement flowers but lacks the ethereal daintiness of karvinskianus. The charm of the plant is the randomness of it, looking like it has self seeded as it so often has.
If you want something that is a compromise between the two consider Lavender Lady. Mine is constrained in a pot and so is not as airy as karvinskianus.
Does anyone know if Erigeron Glaucus "Sea Breeze" is essentially the same flower as Mexican Fleabane (in terms of growing behaviour, ease of growing etc.) They look similar. Thinking of getting some of these too . . .
Have both - Erigeron definitely a lot bigger flowers and pleasantly enthusiastic ground cover in a good way. Only planted Mexican Fleabane last summer but its a bit more delicate, wafty and flowers are a lot smaller.
How is the spread on the Erigeron (I am expecting a few plugs in the next few days). So thinking where I might plant them in regard to the Mexican Fleabane and also the crazy paving spaces etc.
Apologies only saw this now! I've about a two foot drift of Erigeron from a small 9cm pot three years ago which is beside my Mexican Fleabane (only planted last year so much smaller). I'll try send you a photo later in the week.
Yeah only had it two years but the foliage seems to plump up when it warms up! It stays a bit shrively though throughout.
When does yours normally start to flower?
I am thinking that mine need to get planted in the garden now that the "cold weather" has passed. The Mexican Fleabane too. They have all outgrown their potting pots now.
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If you want something that is a compromise between the two consider Lavender Lady. Mine is constrained in a pot and so is not as airy as karvinskianus.
https://www.claireaustin-hardyplants.co.uk/products/erigeron-karvinskianus-lavender-lady
Those are in 9cm pots, so already grown on and should be ready to plant straight out, weather permitting..
Minimum temperature predicted for the next 7 days is 3c.
Last year
Current mound (shoes for scale!)
I am thinking that mine need to get planted in the garden now that the "cold weather" has passed.
The Mexican Fleabane too. They have all outgrown their potting pots now.