Density™ Turf-Grade Maintenance Fertilizer 25-10-12

If your lawn is actively growing and green, it's a good time to apply. In most of Canada, that means spring through early fall. Avoid applying to dormant, frozen, or snow-covered grass.

Light rain after application is helpful — it moves the granules into the soil where they work best. Applying before heavy rain or a sustained downpour is not ideal, as it can wash product off the lawn before it has a chance to dissolve in place. If heavy rain is in the forecast, wait until it passes.

The slow-release nitrogen fraction provides extended feeding for several weeks after application. For most lawns, reapplying every four to six weeks during the growing season is a reasonable cadence. There's no benefit to applying more frequently than that.

A well-maintained lawn typically benefits from around 4 lbs of nitrogen per 1,000 sq ft across the full growing season, spread over 4–5 applications. SeedLaunch Pro and Density share the same SGN 150 format and application method, so you can swap one in for the other depending on whether you're seeding or maintaining. SeedLaunch Pro replaces a Density application in your schedule rather than adding to it.

For example, if you're overseeding in early fall, your season might look like this: Density in early spring, Density in late spring, Density in mid-summer, and SeedLaunch Pro at overseeding in early fall. If you're doing a spring seeding project, flip it: SeedLaunch Pro at planting, then Density for the remaining applications through the season.

The total nitrogen load stays roughly the same either way. You're not doubling up — you're using the right formulation at the right time.

Not ideal. Density is a maintenance fertilizer with a nitrogen-forward 25-10-12 ratio. New seedlings need a phosphorus-forward formula with gentler nitrogen delivery. If you're seeding or overseeding, use SeedLaunch Pro during establishment, then switch to Density once your new grass is established and being mowed regularly.

Yes. Sod arrives with an established root system and is ready for maintenance-level nutrition. You can apply Density to new sod once it's been down for two to three weeks and is rooting into the soil. Water it in after application.

No. Density granules and grass seed have different sizes and weights, so they'll separate in the hopper and spread unevenly. Apply them in separate passes for the best results. And if you're seeding, SeedLaunch Pro is the better fertilizer choice for that application anyway.

If you've only used big-box fertilizer, Density will look and feel different in your spreader. The granules are smaller and more uniform than consumer-grade products, and some prills have a tint from the polymer coating on the slow-release nitrogen. This is normal. SGN 150 mini-prill is standard in professional turf management — it flows differently through a spreader than the larger granules you may be used to, so start at a lower setting than you'd normally use.

We don't provide a single dial number because SGN 150 mini-prill flows differently through every spreader model. Start at the lowest setting where granules begin to flow, then make overlapping passes (north-south, then east-west) until your measured amount is distributed evenly. This gives more control and more even coverage than relying on a dial number calibrated for a different product.

Read more about the recommended low-flow spreader method.

Density contains iron, which can leave rust-coloured marks on concrete, pavers, and stone if granules sit on the surface and get wet. Sweep or blow any stray granules off hard surfaces immediately after application. If you do get a stain, a mild acid-based cleaner or white vinegar usually removes it. Prevention is easier than cleanup — take 30 seconds to clear your walkways after spreading.

Yes, when used as directed. Water it in after application so the granules move into the soil rather than sitting on the surface. Once watered in, the product is in the soil where it belongs.

At the recommended rate, burn risk is low. 30% of the nitrogen is polymer-coated slow-release, which feeds gradually rather than dumping all at once. Apply evenly and avoid piling product in one spot. If you accidentally over-apply in an area, water it thoroughly to dilute.

Each bag covers approximately 1,500 sq ft at the recommended application rate. Measure your lawn and divide by 1,500 to determine how many bags you need per application. If you're between sizes, round up rather than stretching a bag thin.

Most consumer fertilizers maximize coverage by using large granules, filler ingredients, and almost exclusively quick-release nitrogen. Density uses SGN 150 mini-prill, polymer-coated slow-release nitrogen, iron, and a complete micronutrient package — components that cost more to manufacture but deliver meaningfully better performance per square foot. You're covering fewer square feet per bag because more is happening in each one.

At the recommended application rate, Density delivers approximately 1.1 lbs of nitrogen per 1,000 sq ft. Of that, 30% (roughly 0.33 lbs) comes from polymer-coated slow-release nitrogen, providing extended feeding. The remaining 70% is immediately available for a visible green-up response within days of application.

No. Density is a synthetic fertilizer, and that's a deliberate choice. The synthetic formulation is what allows for precise nutrient ratios, controlled-release technology, and consistent performance across applications. If you require a certified organic fertilizer, this isn't the right fit.