Trees, Flowers and other Plants
These representations of natural objects are very commonly found in mediaeval Heraldry and there are quite a few available.
Fruit and Nuts
bunch of grapes, pear, lemon, pineapple, hazelnut, walnut
reed, bundle of reeds, bullrush, thistle, vine, vine leaf, oak leaf, acorn, wheat ear, hop cone
The Farming and Tools category also include a Corn sheaf
Apple, alder, aspen, birch, cedar, chestnut, cypress, fir, palm, pine, willow, yew and a generic tree, which may also be eradicated and blasted. There is also a group of trees known as a hurst, forest, or wood.
Cinquefoil, octofoil, quatrefoil, rose, trefoil, sexfoil, cornflower, poppy, daisy, tulip, bunch of tulips, lily
Common features (that can be given a different colour) include slipped, leaved, trunked, fructed