Dad loves his garden but is a bit of a "plant snob" - what to buy him for Christmas?

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My Dad loves his garden, but is a bit of a plant snob (likes unusual varieties, RHS Member, collects snowdrops, that sort of thing). I'd like to buy him a nice plant (shrub or perennial) for Christmas, but fear my local Wyevale might not quite cut the mustard.

Any recommendations for anything a little bit out of the ordinary?

He has a large, but fairly sheltered garden.

Keepers has very helpful staff that can help you choose a tree and there are lots of dwarf varieties, not all available this time of year though.

hellymelly - born out of laziness, planted them on the allotment as I'm massively crap with veg

-sound of lightbulb pinging-The allotment! oh joy! I can fill it full of roses-if I can wrestle a section off DH that is. We have a new allotment,he is imagining lots of veg next year,at the moment it is ryegrass in a small test bit,garlic in another small bit,two small plots for the dds full of tulip bulbs and more garlic, and lots of weeds.(goes off to hunt for David Austin catalogue in feverish state)

Order him a David Austin rose. They arrive in about 3 days, are bare root so can be planted now (is best time); are GORGEOUS and if he likes roses he will love it, I guarentee!

Can recommend variety if you have idea about his taste...

English Roses- there are whole forums devoted to these!