Probably lots of reasons. Discontinued Sold out Bare root season finished and behind on potting up to sell as container plants. There was a list of other rose suppliers the other day. I can offer Trevor White and Style Roses.
The high demand for roses (and hydrangeas) last year, noted by the RHS, may be a contributing factor, although of course it’s difficult to determine if there is a real/unusual shortage from just the consumer side, and different suppliers may be experiencing — or not experiencing — shortfalls to different extents.
From the RHS article linked below: “...big blooms, long stalwarts of the garden, remain an important draw for UK gardeners as people continue to seek out the familiar during these less than familiar times.”
I read from a recent statement on David Austin’s website that the pandemic has had a huge role to play as well as they have not been able to produce new plants on a pre-Covid scale.. they’ve even had to cease some of their supplier contracts as a result - my local garden centre for example has no DA roses for sale this year.
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Discontinued
Sold out
Bare root season finished and behind on potting up to sell as container plants.
There was a list of other rose suppliers the other day.
I can offer Trevor White and Style Roses.
https://www.rhs.org.uk/press/releases/2021-set-to-see-comfort-planting