The Gardeners Toolbox
Grow More. Waste Less. Garden Smarter.
Free gardening tools built on real growing knowledge. Whether you are planning your seed starts, mapping companion plants, calculating microgreens seed quantities, sprouting in mason jars, or canning your harvest, The Gardeners Toolbox has a free tool for it. No account required. No personal data stored. Just tools that work.
FREE TOOLS FOR EVERY GARDENER
Every tool on this site was built from real hands-on growing experience. Not generic internet advice. Real knowledge from real gardening. Each tool runs entirely in your browser and your data never leaves your device.
Seed Starting Database
The most complete free seed starting reference available. Fifty vegetable and herb varieties across nine categories with planting depth, plant spacing, row spacing, germination temperature, days to germinate, and days to harvest for every variety. Filter by category or search by name. Download your seed starting guide as TXT, PDF, or Word.
Try it: thegardenerstoolbox.com/seed-starting-database
Companion Planting Guide
Plant the right neighbors and your garden thrives. Plant the wrong ones and watch yields drop. Our companion planting guide covers 35 vegetables and herbs with good companions shown in green tags and bad companions in red tags, plus detailed notes explaining why each relationship works or does not. Filter by vegetables or herbs. Download your guide as TXT, PDF, or Word.
Try it: thegardenerstoolbox.com/companion-planting-guide
Microgreens Seed Calculator
Calculate exactly how much seed you need for any microgreens tray size. Select from 35 varieties with pre-loaded commercial seed density rates. Choose your tray size from standard 10×20, 10×10, 5×5, or enter a custom size. Get seed needed in grams and ounces plus expected yield at harvest. Growing tips and soak requirements included for every variety.
Try it: thegardenerstoolbox.com/microgreens-seed-calculator
Sprouting Guide
Everything you need to know to grow fresh sprouts at home in mason jars. Thirty-six varieties across six categories with soak time, rinse schedule, days to harvest, expected yield, flavor profile, nutrition highlights, culinary uses, and safety warnings for varieties that need special handling. Filter by legumes, brassicas, grains, seeds and nuts, alliums, or herbs.
Try it: thegardenerstoolbox.com/sprouting-guide
Canning and Preservation Guide
Complete home canning reference based on USDA approved processing times. Water bath canning, pressure canning, and vacuum sealing covered with jar sizes, processing times, altitude adjustments, safety warnings, and preparation tips for 35 foods. Includes a comprehensive beginner safety guide covering equipment, step by step pressure canning procedure, headspace requirements, altitude adjustments, and botulism prevention.
Try it: thegardenerstoolbox.com/canning-preservation-guide
WHY THE GARDENERS TOOLBOX?
- Built on real growing experience. Every tool reflects actual hands-on knowledge from commercial microgreens production, greenhouse growing, and years of home gardening.
- Always free. Every tool is completely free with no premium tier, no account required, and no usage limits.
- Private by design. All tool calculations happen in your browser. Your data never leaves your device.
- Download everything. Take your results home as TXT, PDF, or Word documents to keep in your garden journal or print for the potting shed.
- Accurate information. Seed starting data, companion planting relationships, sprouting guides, and canning times are all based on established horticultural knowledge and USDA guidelines.
YOUR DATA PRIVACY
Every tool on The Gardeners Toolbox runs entirely within your browser. Your planting notes, seed calculations, and canning schedules never reach our servers. We have no database of user information.
COMING SOON
- Frost Date Calculator: Enter your zip code and get your first and last frost dates with a complete planting calendar.
- Garden Journal: Save and restore a full season planting log with dates, notes, and harvest records.
- Soil Amendment Calculator: Enter your bed dimensions and soil test results to get exact amendment quantities.
- Greenhouse Planner: Square footage, plant capacity, and heating cost calculator for greenhouse growers.
Bookmark thegardenerstoolbox.com and check back often. New tools added regularly.