close proximity to the sea and high winds - so leaves and flowers get blown off or burnt easily
Dwarf conifers, sedum, sempervivum, osmanthus, pines, ceratostigma, rosemary, Trachelospermum, Muehlenbeckia, magnolia grandiflora, grasses, ferns, bamboos, palms, ivy . . . You can always make it more floral by just adding a bit of bedding -- pansies etc -- twice a year. I had a very successful garden like this on a balcony on the 7th floor of a block of flats -- it can be done.
I’m finding that troughs and terracotta pots are ridiculously expensive. I need to find a cheap source.
In my opinion you will do much better with large containers, I wouldn't use any container less than 35L. In terracotta they can be expensive, and of course they can crack. One tip is to look on ebay in January -- that's when the demand is lowest so you may get a bargain. You may also find some B stock. But does it have to be terracotta? Why not use half whisky barrels -- they are cheap and they are big?
Oak Whisky Barrel Tub/Planter – Half Barrel : Amazon.co.uk: Handmade Products
As far as troughs are concerned, if you're handy you can make your own with hypertufa
Make a Hypertufa Trough - FineGardening
By the way, you can always make an ugly container look better by planting something which trails. Muehlenbeckia complexa can look really good in a container, for example -- fabulous when planted with buxus.
Then work out which type of feed I need for which type of plants (and how often)
Then I need to think about whether to build some sort of plastic cloche
Once a year with a continuous feed product like this
Miracle-Gro 17684 All Purpose Continuous Release Plant Food 1 kg, Green, Brown : Amazon.co.uk: Garden & Outdoors
It's more important to get the watering right (consider an irrigation system), and to get the soil right. Some John Innes in the mix retains moisture better, I use this
Westland 10100012 Multipurpose Compost with Added John Innes, 10 L : Amazon.co.uk: Garden & Outdoors
and I add this sort of thing too
Miracle Gro 119923 Moisture Control Pots & Baskets (225g Pouch) - Storing Gel Crystals that Release Water When Plants Need it Most! : Amazon.co.uk: Garden & Outdoors
Cover the surface with gravel and pebbles to reduce evaporation.
(Don't buy from amazon, you can get these things much more cheaply from Wickes for example)