
For years, as CT Sod grew and delivered sod across the Northeast, our customers kept asking the same question: "What fertilizer do I use for new sod?" There was never a clean answer. Homeowners didn't know what to buy, the pros had their own habits, and the few who found something often had no idea how much to apply — or whether it would burn the sod they'd just paid for.
Now there is an answer. Introducing UNDER SOD™ — the biological starter fertilizer made to go *beneath* new sod.
Why it exists
Most bags on the garden-center shelf are labeled "for seed and sod" — but seed and sod are not the same problem. Seed starts from bare ground and has to build roots from scratch. Sod arrives with a mature root system already grown on the farm; its job in the first few weeks is to *bridge* those roots down into your soil. That contact zone — the few inches of earth directly under the turf — is exactly where most starter products were never designed to work. UNDER SOD™ is built for it.
What it is
UNDER SOD™ is a biological 4-2-5 starter fertilizer — a moderate, low-phosphorus, potassium-forward nutrient charge plus the living soil biology young roots actually use. The biology is the product; the nutrients are just the carrier. Full label details and specs are on the UNDER SOD™ product page.
Four endomycorrhizal species (live arbuscular fungi) to extend a young root system's reach
2% seaweed extract (*Ascophyllum nodosum*), plus a named *Bacillus* bacteria consortium and *Trichoderma* to colonize the root zone and free up soil phosphorus
6% humic acid and fulvic acid — and no iron, by design: we root the sod, we don't green the bag
UNDER SOD™ goes beneath new sod at installation — one 25-pound bag per pallet, mixed into 4–6 inches of soil before finish grade. There is no burn risk when used as directed.
Dead-simple to apply
No measuring, no math: one 25-lb bag covers a 500 sq ft pallet of sod. Ordering four pallets? Use four bags. That is the whole calculation.
Who it is for
UNDER SOD™ is for anyone laying fresh sod:
- Homeowners putting in a new lawn — join the notify list.
- Landscapers & installers who want one product they can confidently recommend on every job — become a partner.
- Sod farms, garden centers & distributors — carry UNDER SOD™.
When can you get it?
Ready To Order?
Fresh-Cut Sod Delivered
CT Sod delivers Kentucky Bluegrass, Tall Fescue & RTF sod across CT, MA, NY, NJ, RI, NH, VT & ME.
From The Field
Our Recent Sod Installation Work
Frequently Asked Questions
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What makes UNDER SOD™ different from a regular starter fertilizer?+
How much UNDER SOD™ do I need?+
Will UNDER SOD™ burn my new sod?+
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