Have some spider plants that are ready to propagate? Buy an eight pack of flowers and only needed six? Did you like me start 6 tomato plants hoping only one would make it and now you have five extra? Why not swap the plants with your neighbors. Trade some spider plants for some aloe. Some zucchini for some tomatoes. 

Notice: These plants are from home gardens and may carry pests and disease that may not be healthy for your garden. Trade with caution and when you can, remove the soil from new plants and plant them as bare roots to limit the spread.

Check out these resources about common garden pests and disease. 

Gardeners Supply Company list of common garden bugs (both beneficial and harmful. 

Info on Asian Jumping Worms an invasive species