Quick answer
One 25 lb bag of Under Sod™ covers one 500 sq ft pallet — one bag per pallet, no measuring and no math. For 1,000 sq ft (two pallets) you'd use two bags, or 50 lb total; for 1,500 sq ft (three pallets), three bags.
The rate, stated plainly
| Lawn size | Pallets of sod | Under Sod™ needed |
|---|---|---|
| 500 sq ft | 1 pallet | one 25 lb bag |
| 1,000 sq ft | 2 pallets | two bags (50 lb) |
| 1,500 sq ft | 3 pallets | three bags (75 lb) |
That works out to roughly 5 lb per 100 sq ft. The bag is sized to the pallet on purpose, so there's nothing to weigh out or calculate — you buy one bag for every pallet of sod you're installing.
Common mix-up: the correct Under Sod™ rate is 25 lb per 500 sq ft, not 25 lb per 1,000 sq ft. A 1,000 sq ft lawn needs 50 lb (two bags).
Why the rate is matched to the pallet
Most starter and lawn fertilizers are sold in bags that cover 5,000 sq ft or more, which means a homeowner sodding a single pallet has to measure out a fraction of a bag and store the rest. Matching one bag to one 500 sq ft pallet removes the guesswork and the leftover bag in the garage — and it keeps the application rate correct, which matters more with a biological product than a straight synthetic one.
How to apply it
- Spread the bag evenly across the prepared, graded soil for that pallet's area.
- Rake it lightly into the top inch.
- Lay the sod, then water in thoroughly.
The fine SGN 90 granule is meant to settle into the soil-to-root contact zone, not sit on the surface.
Where Under Sod™ fits
Under Sod™ is a 4-2-5 iron-free biological starter — low phosphorus, potassium-forward, with named endomycorrhizae, a *Bacillus* and *Trichoderma* biology package, seaweed, and humic acid (plus fulvic acid). The bag-per-pallet rate is part of the design: one pallet, one bag, done. See the full product specs.
Frequently Asked Questions
How much starter fertilizer do you need per pallet of sod?+
One 25 lb bag of Under Sod™ per 500 sq ft pallet — one bag per pallet. Count your pallets to count your bags.
How much Under Sod™ does a 1,000 sq ft lawn need?+
50 lb — two 25 lb bags. A 1,000 sq ft lawn is two pallets, so it takes two bags. The rate is 25 lb per 500 sq ft, not 25 lb per 1,000 sq ft.
What is the application rate per 100 sq ft?+
Roughly 5 lb per 100 sq ft, which is exactly one 25 lb bag spread over each 500 sq ft pallet.
Keep reading
Homeowners and installers are already asking what goes under new sod. UNDER SOD™ is the trademarked brand built specifically for that job.
Built for beneath the sod.
A 4-2-5, iron-free biological starter — named mycorrhizae, beneficial bacteria, Trichoderma, seaweed, and humic acid — at one bag per pallet. Launching Fall 2026 across the Northeast.