Real captures of the live app. Nothing here is a mockup.
- Instant download
- No internet required
- Works on any device
- Yours to keep
The 12-Month Lawn Program
Seed, feed, mow and water on the right day, with the exact amounts for your lawn.
- Instant download
- No internet required
- Works on any device
- Yours to keep
Not sure yet? Try the free demo →
Secure checkout by PayPal or Dodo Payments. No refunds for a change of mind.
The whole year
Every job on the right date for your grass.
Exact amounts
Pounds of your fertilizer and your seed, for your lawn.
Works offline
Use it anywhere. Nothing is uploaded or stored online.
One-time purchase
No subscriptions. No recurring fees.
About this program
The 12-Month Lawn Program plans a year of lawn care for your grass and your square footage: every feeding with the exact amount of your fertilizer, crabgrass preventer, grub checks, aeration, overseeding, mowing heights and watering, each on the right date.
The schedules follow Purdue's and NC State's extension programs. It's a single HTML file you own: no subscription, no account, and it works offline.
What it does
- 9 grasses, cool- and warm-season
- Overseeding, new seed, sod or winter ryegrass, with seed pounds, pallets and topdressing worked out
- Every feeding with the exact amount of your fertilizer, on Purdue's and NC State's schedules
- Crabgrass preventer, grub check, aeration and fall weed control on the right dates
- Mowing heights for every grass
- A day-by-day watering routine for new grass and sod
- The first mow and mowing heights
- Weekly watering in minutes per sprinkler zone, minus the rain
- Calendar download
- Works offline; your data stays on your device
What's included
- 1 offline HTML file you keep
- Installable copy for your phone
- Calendar file with every job
- Backup and restore to a file
- Lifetime access to this version
File type
Single HTML file
Works on
Windows, Mac, iPhone, Android
iPad, tablets
Delivery
Instant download after purchase
No shipping required
Frequently asked questions
Can I try it before I buy? +
Yes. The free demo is the real app, not a video or a mockup. It's capped to 1 lawn and 1 sprinkler zone, and nothing you enter is saved: closing the tab clears it. Calendar downloads, backups and printing are in the full version. Buy to remove the cap and keep what you build.
Which grasses does it cover? +
Nine: Kentucky bluegrass, tall fescue, perennial ryegrass and fine fescue (cool-season), and Bermudagrass, zoysia, centipede, St. Augustine and buffalograss (warm-season). Not sure which you have? Our cool-season vs. warm-season grass guide helps.
Is this a subscription? +
$19.00, once. No account is created, so there is nothing to cancel, and no recurring charge, ever.
What exactly do I get? +
Two things from the same purchase: a single HTML file you download and own, and an installable copy of the same app for your phone's home screen. Either one works fully offline after the first load. The download link is on the page you land on after paying, and in your receipt email.
Does it work without internet? +
Yes, after the first load. Everything works with no connection: there's nothing on the other end for it to talk to.
Where does my data go? +
Nowhere. It stays on your device, in the browser you use the app in. HarvestMath doesn't run a server that sees it. To move to another phone or computer, save a backup file from the More tab and restore it there.
What about HarvestMath Garden? +
HarvestMath Garden plans your whole garden in one place, and Garden buyers get this app too, plus 4 more apps. Pick it above the payment buttons to buy it instead, for $49. Already bought this app? What you paid counts toward it: the Garden costs you $30 (never less than $30), and your receipt email has an upgrade link with your order filled in.
Is there a refund? +
No refunds for a change of mind: the free demo is the real app (just capped, and it doesn't save), so you can see exactly how it works before you pay. If something is broken, or you were charged by mistake, email hello@harvestmath.com and we'll make it right.