GrowVeg's Garden Planner has been refined since 2007 and also powers the Old Farmer's Almanac Garden Planner. It's the most complete paid planner on the web. Siltwell is younger, free at its core, and built around live weather. We compare the two row by row below.
GrowVeg details verified from growveg.com (features, trial & subscription pages), August 2026. The Almanac Garden Planner shares the same engine and pricing. Spot something outdated? Tell us.
GrowVeg fits if catalog depth decides it. It has 400+ crops and 21,000+ varieties, two decades of refinement, research-backed companion data, and 440+ how-to videos. No younger planner matches that library, ours included. It's worth $35/yr if you'll use it.
Siltwell fits if you want a planner that stays free, or live weather doing the work. Watering guidance from the forecast is free. On Pro, your own weather station calibrates frost alerts to your microclimate, and your soil sensors tell you which bed is dry. It also has native phone apps that work offline in the garden.
GrowVeg plans from your region's climate history. Siltwell plans from the conditions in your own yard. If you already pay for GrowVeg, its planner won't disappoint you. The weather features are the reason to switch.
Compare for yourself