Stop guessing at fertilizer. GroundKit turns your soil test into exact NPK (nitrogen, phosphorus, potassium) recommendations — organic or conventional — for every bed and crop. Plus zone-aware seed planning and a frost-smart planting calendar.
See It In Action
GroundKit meets you where you are. Enter your soil test results, your USDA zone, and your season — and get precise amendment recommendations and a full planting plan built around your beds.
Everything You Need
From soil test to harvest, GroundKit gives you the soil intelligence and planning tools to grow with confidence every season.
NPK stands for nitrogen, phosphorus, and potassium — the three macronutrients every plant needs. Enter your soil test values and get precise amendment recommendations tailored to your crops and garden beds. Know exactly what your soil needs before you plant.
Precision amendmentsDiscover crops matched to your USDA zone, soil, and season. Pin the ones you're growing to track them through the season.
Zone-matched picksLay out your beds, assign crops, and visualize your full growing space. See companion plant suggestions and what was grown in each cell last season — all before you dig a single hole.
Visual bed layoutTrack planting events on a visual calendar with frost-date awareness. Set your last and first frost dates to see your safe growing window highlighted in green.
Zone-aware schedulingBrowse organic and conventional amendments with an organic-only filter, then plan compost application bed-by-bed with cubic-foot volumes and NPK delivery estimates. Supports standard compost, worm castings, or custom blends.
Organic + bed volumesLog what you grow, when you harvest, and what worked. Add photos, tag events, and link entries to your beds and crops.
PremiumSimple Process
No agronomist required. GroundKit makes precision soil management and garden planning accessible to every grower.
Input your N, P, and K values from a soil test kit, or use the symptom guide if you don't have a test yet. GroundKit remembers everything across all your beds.
Receive precise NPK amendment recommendations for your specific crops and beds — with organic and conventional options you can filter to your preference.
Use the seed planner, garden layout tool, and planting calendar together. Your growing season, fully organized and built around your soil and zone.
Local Extension Support
GroundKit connects you to your local Cooperative Extension agent for region-specific advice. Get expert guidance tailored to your county and climate.
67+ Crops
Hand-crafted watercolor art for every plant in our database.
Flexible Plans
Start free. Unlock everything when you're ready. No hidden fees, no upsells.
Always free
Get started with the basics and try GroundKit before you upgrade.
per month
Full premium access with month-to-month flexibility. Cancel anytime.
per year · billed annually
The complete tool for the serious home gardener. Save 50% vs monthly.
one-time · forever
Pay once, grow forever. All future features included at no additional cost.
All paid plans unlock the same premium features. Subscriptions auto-renew until cancelled in App Store settings.
