@NoSlugsPlease, l should think it would be possible to move all of them, assuming they're not massive. The penstemon definitely (l would take cuttings late summer as insurance). I have moved roses of that age, although admittedly only from one part of the garden to another and they have survived. How big are the weigela, hypericum and hebe ?
I would also say that if you are using an estate agent (or even if not) then be sure to mention that those plants will be coming with you.
Thank you everyone, for the advice. We are thinking of renting out our current house instead of selling as we might not get back the money we've spent on it so far. So it's a balance between moving the plants I want vs leaving enough to maintain a 'nice' garden.
@AnniD the 3 plants are still small, probably just over 30cm tall, but the hypericum has spread sideways quite a bit and is very leafy.
@NoSlugsPlease, l had to look up that variety of Hypericum as l hadn't heard of it before. I would do the same with that, take cuttings and also from the weigela and hebe if you are able to, before digging them up. That way, you have insurance. It probably wouldn't hurt to do that anyway even if you decide not to move out, especially as your plans are still fluid at the moment.
@NoSlugsPlease if you are going to rent the house out can you be sure that the tenant will have any interest in maintaining the garden beyond cutting the grass occasionally?
@KT53 true, it's just speculation on my part as we have no idea what sort of tenants we might get. As we are in a small house (but with a decent-sized garden) in a rural area, I'm hoping that the tenants would be the type who are interested in maintaining a garden. If they are not, then I will take Busy-Lizzie's approach and dig up as many plants as we are able to transport.
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I have moved roses of that age, although admittedly only from one part of the garden to another and they have survived.
How big are the weigela, hypericum and hebe ?
I would also say that if you are using an estate agent (or even if not) then be sure to mention that those plants will be coming with you.
I would do the same with that, take cuttings and also from the weigela and hebe if you are able to, before digging them up. That way, you have insurance.
It probably wouldn't hurt to do that anyway even if you decide not to move out, especially as your plans are still fluid at the moment.