The gardening app that knows your garden.
Most garden apps hand out a generic schedule. Siltwell reads your real weather to tell you what to plant, when to water, and when frost is coming. It's free to start and works offline. With Pro, it also reads your weather station and soil sensors.
Does your garden run colder than your weather app thinks?
Enter your town and we'll compare the forecast lows to what nearby home weather stations recorded. Then we'll tell you, in one sentence, how far off your microclimate runs.
Sample result
Gardens near you ran 2–5°C colder than the forecast low on recent nights.
At that offset, a garden can freeze on a night the forecast keeps above 0°C. That changes when you cover tender plants.
Your plants don't follow a calendar. Your app shouldn't either.
A fixed schedule can't tell if your soil is bone-dry or still soaked from last night's storm. It guesses, and your plants pay for it. Siltwell works from what's happening in your garden.
Know when to water
Water the bed that needs it. Skip the one that's still wet.
Connect a weather station and per-bed soil sensors, and Siltwell watches rainfall and soil moisture. It tells you exactly which beds to water today. A fixed schedule ignores the weather, so your tomatoes can dry out in a hot week. Per-bed alerts come with Siltwell Pro.
Still time to grow
There's still time for a fall harvest. We'll show you what to plant now.
Tell Siltwell where you garden, and it estimates your first frost from ten years of local weather. Then it suggests what will finish in time. "Radish, about 30 days, comfortably before your first frost." Plant with a deadline you can trust.
Plan your beds
A layout planner that remembers what grew where.
Drag your crops onto a to-scale map of your beds. Siltwell warns you when you're planting tomatoes where tomatoes grew last year, or basil beside something it can't stand. Rotating crop families keeps soilborne disease from building up in one bed. Both checks are built in and free.
See your season
Log it in seconds. Watch your harvest add up.
Snap a photo and note what you picked. Siltwell totals your season by crop and shows "on this day" from years past. It keeps your garden's story for you.
Garden together
One garden, the whole household.
Invite up to three people to your garden. Everyone sees the same beds, tasks, and harvests, and anything they log shows up for you too. Nobody has to text "did you water the tomatoes?" again. Sharing comes with Siltwell Pro.
For weather-station owners
If you own an Ecowitt, Ambient, or Tempest, Siltwell is the app it was waiting for.
Siltwell is the only garden app that plugs into your consumer weather station and soil sensors. It learns how far your yard runs from the forecast and tunes frost warnings to match. It also turns per-bed soil moisture into watering alerts you can trust.
- Per-bed soil-moisture watering alerts
- Frost warnings tuned to your yard's real readings
- Your station vs. the local area, side by side
- 14-day free trial, then $22 a year (list $39). That founding price is locked in while you stay subscribed.
18%
Water today
0.42″
From your rain gauge
Low
42 nights out
−2.1°
vs. forecast
Pricing
Siltwell is free where it counts. Pro is $22 a year.
Free, forever
$0
- Bed layout with rotation & companion warnings
- Planting & harvest journal, with photos
- Hand-curated catalog of 150+ plants
- Frost-date estimate for your location
- “Ask Claude,” an assistant that knows your garden
- Logging works offline and syncs later
You don't need a credit card.
Siltwell Pro
list price $39, founding price$22/year
- Everything in Free, plus:
- Connect your weather station & soil sensors
- Per-bed soil-moisture watering alerts
- Microclimate-calibrated frost warnings
- Unlimited weather history & photos
- Share your garden with up to 3 household members
- Founding price locked in while you stay subscribed
Cancel anytime.
We publish where our plant data comes from. Data sources.
Common questions.
Latest guides
How to run a garden irrigation system by which zone is dry
How to choose a garden irrigation system and use a per-bed soil reading and rain guidance to run it only where a bed has gone dry.
How straw bale gardening works and why bales dry out fast
Learn why a straw bale dries faster than soil, how to condition it, and how to water by the bale's moisture instead of a schedule.
Vegetable planting companions and the watering they share
Group vegetable planting companions by shared water needs and season length, and let a per-bed dry alert show which bed to water.
