Sow Now uses your garden's own sensors and Growing Degree Day science to tell you exactly when to plant, water, and harvest — every morning, on your phone.
From £99 one-off · £4.99/month · No gateway required · Works with Ecowitt WS69
No command lines, no config files. Your kit ships pre-provisioned. The app walks you through everything.
Hub, sensors, and a single QR card. Everything is pre-configured at packing time — no setup required.
Scan the QR code. The app links your hub to your account and connects to your home Wi-Fi automatically.
Push soil probes into your beds, clip the greenhouse sensor to a frame. Fully wireless — batteries last 12+ months.
At 7am you get a notification. Three specific things to do today, based on your actual garden's data.
We read your Ecowitt WS69 weather station directly via radio — the same temperature your plants actually experience, not an average from 10 miles away.
Capacitive sensors in each bed tell you exactly which one needs watering — not a general garden average. No wasted water, no stressed plants.
Your greenhouse can be running 80+ GDD ahead of the garden. Sow Now tracks both zones independently so you know when seedlings are truly ready to move out.
Based on accumulated GDD and your crop's target, we tell you when to expect your first harvest — updated daily as conditions change.
When your sensor reads below 2°C, you get an alert before it happens — not after. Enough time to cover vulnerable plants.
The Sow Now hub decodes your Ecowitt station directly using a built-in radio receiver — no Ecowitt gateway, no Ecowitt cloud dependency.
Professional growers have used GDD to predict crop development since the 1950s. It's the accumulated heat energy above a crop's base temperature — a far more accurate predictor of plant development than a calendar date.
The difference is that Sow Now uses your actual sensor readings — not a weather forecast API. Your south-facing greenhouse wall might be accumulating GDD twice as fast as your garden. No weather service can tell you that.
| Crop | Base temp | GDD to harvest |
|---|---|---|
| Tomato | 10°C | 1,000–1,400 |
| French bean | 10°C | 800–1,000 |
| Sweetcorn | 10°C | 1,400–1,600 |
| Pea | 4°C | 1,000–1,200 |
| Carrot | 7°C | 1,200–1,500 |
The kit is yours forever. The subscription pays for daily AI advice, push alerts, and unlimited crop tracking. Cancel anytime.
One missed sowing window or a wasted tray of seedlings costs more than a year's subscription. Sow Now pays for itself.
"I've been growing tomatoes for 20 years and always struggled to know when to move seedlings outside. This year Sow Now told me exactly when — and they were the best plants I've ever grown."
"The soil moisture alerts alone are worth it. I used to overwater half my beds and underwater the other half. Now the app tells me which bed needs attention before I even go outside."
"I already had the Ecowitt station. Setting up Sow Now took less than 10 minutes. The fact it doesn't use the Ecowitt app or cloud is a big deal for me — everything stays on my own system."