To celebrate spring, here's a kinda of remake of a gardening set I made for Sims 3 long time ago, but renewed and adapted to Sims 4 activities: it now includes a flower arrangement table (Seasons is required), but I also made it as simple surface.
The dried plants can be put on the side of the table as decor, but can also be hang on corkboard or wall.
Your Sims will also find decorative gardening tools, different kinds of barrows, in which you can put things, a compost and a water tanks.