Terra: Weather-Based Gardening

Turn local weather into plant watering guidance. Physics-based evapotranspiration modeling, five-day projections, and beautiful Home Screen widgets.

Your garden changes with the weather.

Plant water loss changes throughout the day with temperature, humidity, wind, solar energy, and rainfall. Different plants respond to the same atmosphere in different ways. A tomato and a rosemary plant should not be treated as though they have identical water-use patterns.

Terra combines local weather, modeling of evaporation and transpiration rates, and plant-specific profiles to estimate how much water outdoor plants lose to the atmosphere. Track modeled water reserve, explore how it may change over the next five days, and use the forecast as added context before deciding when to water.

Add vegetables, fruit, herbs, trees, vines, container plants, raised beds, and in-ground plants across multiple locations.

FIVE-DAY GARDEN FORECAST

Terra projects each plant’s modeled reserve across the next five calendar days using hourly forecast weather, plant-specific crop coefficients, and chronological rain estimates.

View: • Daily temperature, humidity, wind, solar energy, and rain • Current and end-of-forecast reserve • Daily reserve estimates • Likely watering windows based on each plant’s threshold • Rain and no-rain scenarios when uncertainty matters

Forecasts are projections only. Observed conditions replace estimates as time passes.

HOME SCREEN WIDGETS

Keep garden conditions visible without opening the app.

• Small widget: today’s weather, a five-day summary, and threshold notices • Medium widget: atmospheric data with multiple plant projections • Large widget: atmospheric conditions, weather cards, and five-day plant forecasts • Log Watering from plant widgets

PRIVATE BY DESIGN

No account. No sign-in. No continuous location tracking.

Terra uses only the garden locations you choose. Your plants, watering history, notes, and modeled reserve data remain tied to your app experience rather than a social profile.

Includes 14 days of free access. No sign-up required.

AT A GLANCE

• Estimated Water Reserve for every plant • Five-day plant reserve projections • Hourly weather-based evapotranspiration calculations • Temperature, humidity, wind, rain, and modeled solar energy • More than 200 plant-specific crop-coefficient presets • Growing-environment, soil-texture, root-depth, and sun-exposure profiles • Chronological rain credit and rain-uncertainty scenarios • Log Thorough Watering with watering history • Small, medium, and large Home Screen widgets • Multiple locations and manual coordinates • Customary and metric units • Color themes

BUILT AROUND THE WEATHER

Terra considers temperature, relative humidity, wind, cloud cover, precipitation, sun position, time of day, season, latitude, longitude, terrain elevation, sun exposure, and each plant’s crop coefficient.

Reference evapotranspiration is modeled with the FAO-56 Penman–Monteith framework, WeatherKit data, and modeled solar radiation. Plant-specific crop coefficients translate atmospheric demand into estimated plant water loss.

MODELED SOLAR ENERGY

Incoming solar radiation is modeled from sun position, location, date and time, terrain elevation, and cloud cover. The same value is used in the evapotranspiration calculation, displayed in the app, and synchronized to widgets.

A MODEL, NOT A SENSOR

Terra does not measure soil moisture.

Estimated Water Reserve is a meteorological and physics-based model, not a direct reading from your soil or plant. Use it alongside your own observation of the plant, soil, and growing environment.

Terra cannot account for every site-specific process, including runoff, canopy interception, deep drainage, container geometry, overhead shelter, infiltration, root restrictions, or water applied.

Use Terra as decision support, not as a substitute for checking your plants and soil.

Garden with the weather, not just the calendar.

Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/