BioGardens.org is a non-profit initiative promoting sustainable biological gardening worldwide. It supports a global community of gardeners with a free online encyclopedia covering 457,468 plant species, including growing conditions, companion plants, pests, and seasonal information. The resource features 171,000 licensed photographs and can be used without an account.

The site brings together practical guidance on soil health, organic gardening, plant care, composting and recycling, water management, pest and disease control, and seasonal and plant-specific topics. Its plant categories include pollinator plants, nitrogen fixers, native plants, ground covers, medicinal plants, green manures, and wildlife food. Gardeners can also explore books, community discussions, events, and resources for children.

BioGardens.org offers tools for planning and learning, including a planting calendar, plant and pest identification, companion planting support, and a compost calculator. Its gardening assistant, BioGardy, answers questions using information from the encyclopedia. The site is published by Smitteck GmbH and aims to help people grow plants without synthetic inputs.