GARDENLETTER
A garden almanac — practical guides, planting know-how, and growing wisdom.
From frost dates to fertilizer rates, GardenLetter pairs free hands-on calculators with practical growing guides and a richly illustrated plant museum. Dig in, plan your beds, and grow with confidence.
Garden Tools & Calculators
Free planners for every stage of the season — watering, planting, composting, soil, and feeding.
Garden Watering Calculator
Determine exact water requirements for your plants based on soil type, climate, season, and rainfall
Plant Companion Calculator
Discover beneficial plant combinations, avoid harmful pairings, and score your garden's compatibility
Seed Starting Date Calculator
Calculate indoor and outdoor planting dates from your last frost date, with succession scheduling
Compost Ratio Calculator
Balance the carbon-to-nitrogen ratio of your pile and troubleshoot common composting problems
Garden Bed Soil Mix Calculator
Calculate exact soil, compost, and amendment quantities for raised beds and container gardens
Fertilizer Application Calculator
Calculate precise NPK application rates for organic and synthetic fertilizers by plant and area
The Garden Museum
Wander an immersive museum of the world’s gardens — three collections spanning famous gardens of the world, garden styles & design, and flowers & blooms, each with its own gallery so you can trace the histories and ideas that connect them.
Tour the museum →From the Journal
Fresh growing guides, plant-care tips, and seasonal know-how.
The Ultimate Collection of Gardening Books That Will Transform Your Green Thumb Journey
The Ultimate Collection of Gardening Books That Will Transform Your Green Thumb Journey Gardening is more than a hobby—it’s a lifelong journey filled with discovery, experimentation, and the joy of…
Beyond Aesthetics: The Multifaceted Benefits of Urban Gardening
The Green Pulse of Cities: Transforming Urban Spaces Through Gardening In an era where concrete jungles dominate skylines, urban gardening emerges as a vibrant counterpoint—a testament to humanity’s enduring bond…
Boldly Transform Your Outdoor Space: Innovative Garden Design Ideas That Inspire
Boldly Transform Your Outdoor Space: Innovative Garden Design Ideas That Inspire Gardens are not merely collections of plants; they’re living expressions of creativity, functionality, and personal style. With thoughtful design…
The Green Heart of Neighborhoods: How Community Gardening Builds Stronger Communities
The Green Heart of Neighborhoods: How Community Gardening Builds Stronger Communities In an era where urban life often feels isolating and disconnected from nature, community gardens have emerged as vibrant…
The Art of Cultivating Abundance: Advanced Gardening Techniques for Modern Growers
The Art of Cultivating Abundance: Advanced Gardening Techniques for Modern Growers Gardening has evolved far beyond the simple act of planting seeds and watering them regularly. Today’s horticulturalists employ sophisticated…
Capturing Nature’s Canvas: Mastering the Art of Garden Photography
Capturing Nature’s Canvas: Mastering the Art of Garden Photography Gardens are living works of art, constantly evolving with every bloom, breeze, and season. Yet, their true beauty often lies hidden…
Keep Learning
Plant families, pests, techniques, and a plain-language gardening glossary — everything you need to dig deeper.
Visit the Learn hub →