On plants kept outdoors, Spider Mites are sometimes controlled by other insect predators.
Attract these predators to your garden by incorporating a mixture of native plants (that can be hanging or climbing, too!), shrubs, trees and grasses.
Homemade insecticides are easy to make, gentle, and an excellent first attempt for controlling infestations; particularly on indoor plants. They can be made by combining either of the following with 2 cups of water: garlic puree, chopped chilli and bio-washing up liquid. The more ingredients used, the stronger the pesticide.
Rubbing alcohol, or isopropanol, can be useful when used against sap-sucking pests, such as Spider Mites.
Neem or other horticultural oils can be effective at tackling spider mites.