Raising bed what to do with existing plants and when

[simon12]

I am totally new to gardening and have no idea really what I am doing. I have a very clay soil and this year have mixed in some compost and planted various plants. I decided for next year I want to raise the bed by around 6 inches (as the fence one side is good for that height). Its to early to tell how my current plants are doing but I want to keep any that live to the end of summer, I also want to plant more raspberries in November (I think thats the correct time).
So my 1st question is when is a good time to do this?
2nd Should I just dig up all the plants I want to keep and replant then as they were?
3rd What should I raise the bed with, is just compost best? & how much should I mix in the soil below or just put it ontop.
4th I get alot of slugs that have eated a huge amount of the lettuce I planted is there anything I can do while raising the bed to reduce there numbers?
The plants I currently have that I would want to keep are:
2 x Strawberry bought in pots and look to be doing and and were fairly large when bought.
1 x Tayberry 2 year potted plant planted 2 weeks ago
2 x loganberry one 1 yr potted planted 2-3 months ago 1 2 year pooted planted 2 weeks ago
1 x Black currant age unknown planted 2 weeks ago
1 x raspberry planted 3 months ago only 1 out of 4 to grow.
Any additional advice welcome. Thank you in advance.

[Two_Sheds]

Why do you want to put these plants in a raised bed? Now that they're planted, I would just leave them, and add a mulch of garden compost or leafmould every year

[simon12]

I suppose I could if the plants I have do OK, but I read Raspberries don't like clay soil at all. Any advise if I do decide to?

[Feral007]

If they don't like clay soil they won't last this summer anyway. I'd add lots of mulchy stuff on top of the clay all summer and see what happens.

We've pulled up a couple of trees that had been in for around 2-3 years around the house. But they weren't going great guns. They were just marking time, so we just carefully took them out and moved them to another area, where they did pretty well until the no rain situation.

If your plants start to look unhappy then I suppose you could put them back in pots for a while.
The worst would probably be if half of them love it and half hate it.

[zazen999]

I suppose I could if the plants I have do OK, but I read Raspberries don't like clay soil at all. Any advise if I do decide to?

They seem to be fine on my plot which is thick clay. Don't believe all you read!