For dramatic play how about a garden center with toy rake, shovel, flowers, wheel barrel etc. More plastic flowers could be sorted by color, Science could be nests, eggs, flowers,etc. In the sand table coffee grounds, plastic flower pots small garden tools, plastic or silk flowers etc. are fun. You could have dolls, or flannel board characters that have to dress for the changing weather or put the real items in a dress up corner. For the 3's you can use flowers again and put so many of each in a pringles can vase or put blue feathers on a blue bird etc.
Art is endless with kites,clouds,lambs, lions,flowers bees,and many more ideas.
Keep out some standards too dolls,beads, books, puzzles, trucks and cars, housekeeping, blocks etc. This helps the children really get a feel for the topic. Hope this helps.