Seasonal variation changes alot, but not more so than with flowers, nuts, berries and mushrooms. Times and success depend greatly on the weather and conditions in the year. Making it even more exciting using them.
Flowers
Such a lovely thing to make use of, you would be surprised how many are edible.
Elder(sambucus nigra)
The beautiful and delicate elderflower, surely the best flower to eat, drink and be merry with.

Gorse(Ulex europaeus)
Gorse has a sweet coconut scent. Eat them in salads, garnish south east asian dishes, make ice cream, or wine. Get them while thery're good
Mustard(brassica nigra)
Amazing hot sweet flavour. Similar to colemans with a hot sweetness.
Haw(crataegus oxyacantha)
Dandelion(taraxacum oficinale)
Lime blossom(citrus auratifolia)
Fruit

Rowan berries(sorbus aucuparia)
Blackberries(rubus fruticosus)
Medlars(mespilus germanica)
Quince(chaenomeles japonica)
Crab apples
Elderberries
Wild strawberries(fragaria vesca)

Damsons/wild plums(prunus damacunum)
Sloes(prunus spinosa)
Rosehips
Haw(Crataegus oxyacantha) berries
Nuts

Walnuts (genus Juglans) Beech (genus Fagus)Acorn(quercus), Cob/Hazel(corylus) Pig nuts
Mushrooms

Far too many to mention, and not always easy to get when you want, but always delicious when you do. Honey fungus, Parasol, Bollette (ceps)
Rustlers, Blewitts, Jews ear, Hen of the woods, Chicken of the woods, Beef steak, are all noteable, with they're deep intense flavours.
