The gardening app that actually knows your garden.
Most garden apps hand out a generic schedule. Siltwell reads your real weather, and your soil if you have sensors, to tell you what to plant, when to water, and when frost is coming. Free to start. Works offline.
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 actually recorded — and tell you, in one sentence, how far off your microclimate runs.
Sample result
Gardens near you ran 2–5°C colder than forecast on clear nights.
A real microclimate offset like this changes when you water and 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, so it guesses, and your plants pay for it. Siltwell works from what's actually happening in your garden.
Know when to water
Water the bed that needs it. Skip the one it rained on.
Connect a weather station and per-bed soil sensors, and Siltwell watches rainfall and moisture, then tells you exactly which beds to water today. No more crispy tomatoes from a schedule that ignored the weather.
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 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. Crop rotation and companion planting, built in and free.
See your season
Log it in seconds. Watch your harvest add up.
Snap a photo, note what you picked, and Siltwell totals your season by crop and shows "on this day" from years past. Your garden's story, kept 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. No more "did you water the tomatoes?" texts. Sharing comes with Siltwell Pro.
For weather-station owners
Own an Ecowitt, Ambient, or Tempest? This is the app it was waiting for.
Siltwell is the only garden app that plugs into your consumer weather station and soil sensors. It calibrates frost warnings to your actual microclimate, not the airport twenty miles away, and turns per-bed soil moisture into watering 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/year — the founding price, locked for life (list $39)
18%
Water today
0.42″
Skip Bed 2
Low
42 nights out
−2.1°
vs. airport
Honest pricing
Free where it counts. $22 a year if you want the magic.
Free, forever
$0
- Bed layout with rotation & companion warnings
- Planting & harvest journal, with photos
- 155-plant hand-curated catalog
- Frost-date estimate for your location
- “Ask Claude,” an assistant that knows your garden
- Everything works offline
No credit card.
Siltwell Pro
was $39, now$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 your household — 3 member seats
- Founding price locked for as long as you stay
Cancel anytime. Founding price locked for life.
We even publish where our plant data comes from. Data sources.
Questions, answered plainly.
Latest guides
Setting a Soil Moisture Baseline: The Number Each Bed Should Be Watered At
A live moisture reading means nothing until you know that bed's dry line. How to set a per-bed baseline and confirm "dry" without false alarms.
Waterproof Soil Moisture Sensors: What a Probe Buried in the Bed Year-Round Actually Decides
Buyers want a soil probe they can leave buried, not a handheld spot-check. Here's what a continuously buried reading actually tells you to do — bed by bed.
What Makes Soil Fertile — and Why Richer Soil Changes How Often You Water
Fertile soil is organic matter plus structure plus biology — and the amendments that build it also make your beds dry slower. Here's how to see that per bed.
