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new novice gardener - what to do in the winter

in Plants
Hi, I'm new to gardening and this is my first year of planting after my husband built me some planters. The seem to be going well (with a few exceptions) but my main problem is i haven't got a clue what to do with them once the summer is over. they all cost quite a bit of money as you know, so I'm hoping that they will come back year after year. (fingers crossed). wonder if anyone can help (sorry long list) :-)
i have the following
lobelia
roses,
lavender
cosmos
osteospermum
alyssum
hydrangeas
dahlias
fusias
lythrum
petunias
violas
marigolds
thank you in advance
i have the following
lobelia
roses,
lavender
cosmos
osteospermum
alyssum
hydrangeas
dahlias
fusias
lythrum
petunias
violas
marigolds
thank you in advance
0
Posts
roses: hardy shrub, comes back every year. Prune as per variety (if unknown, prune in March to knee height.)
lavender: hardy shrub, but replace every few year when they get leggy.
cosmos: Annual bedding
osteospermum: Usually grown as annual bedding but is a tender perennial so can come back if protected.
alyssum: Some are hardy, some not. Which variety?
hydrangeas: hardy shrub
dahlias: May come back if tuber lifted in autumn and/or if protected from wet & cold.
fusias: Showy types are grown as annuals but a few may survive if lifted when flowering stops, potted and kept frost free over winter.
lythrum: Depends but probably a hardy perennial - will die back to the ground but come again next year.
petunias: annual bedding
violas: hardy perennial but usually grown as annual bedding and replaced
marigolds: annual bedding