Please help me.

[CPHB2021]

Hello!
Total novice but would like to inject some colour and life into my new build garden.
I would like to make a flower bed against my back fence and plant hydrangeas/lavender/alliums and seasonal bulbs. Would these be ok together and when could I plant them?
Also, the big thing, HOW do I go about creating the flower bed?! The grass slopes downwards towards the fence, can it be on a slope? Thank you so much in advance x

What direction does the fence face in and how many hours of sun does it get per day? Hydrangeas like a bit of dappled shade and damp soil where as lavender likes free draining soil and full sun so they won't both be happy next to each other. Also new build garden are usually rubble with a thin layer of topsoil so be prepared for some hard work digging the rocks out.

Hello! Thank you for replying. Garden is south facing but fence NF, does get a decent amount of sun per day, especially during the summer months. Slopes downwards towards the fence and there is a French drain inbetween our fence and the garden below. The garden is pretty good and has seemingly been laid well, only know this as we dug up 1/4 of the turf last year to lay a new patio and it was just soil underneath. 😊

The things that stands out for my is the mix of hydrangeas and lavendars. They like totally different conditions, so at least one of them is going to be unhappy.

Lavendar tends to want to be scorched with hot sun and sat in poor, free draining soil. Hydrangeas prefer partial shade and thrive in moist soils.

The bulbs are likely to be ok, whichever you've got.

Do you know if your soil is freedraining (i.e. often dry even if it's rained recently) or more clay (often still wet/damp even after several days of no rain)?

How big is the run of fence and how "deep" i.e front to back do you want the bed to be?

Thankyou!
I think I will opt for hydrangeas over lavender then.
I am not sure about the soil 😬 it tends to be moist most of the time, unless it has been super sunny then it can be pretty dry, but I am talking literally heights of the summer if not watered. X

Fence is about 4-4.5 meters. I don't really mind how deep, maybe 80cm-1m , is that realistic?

Unless you are particularly enamoured of your fence, I was wondering if you wanted to grow something a bit taller at the back? I think you said it was the back fence so it might be nice to add a bit of height to the planting. Either with a couple of shrubs that will eventually get tall or a small tree or two, or some climbers, or a combination of these?