Lawn fertilization in Nanaimo is more about timing than anything else. Coastal BC has a long growing season — March through October most years — and grass needs different nutrients at different points in that window. Get the timing right and the lawn stays dense, healthy, and resistant to moss and disease. Get it wrong and you waste fertilizer or, worse, push growth at the wrong time and create problems.
Spring fertilization, the wake-up
The first fertilization of the year usually goes down in late March or early April, after the soil has warmed enough that the grass is actively growing. A balanced granular product with moderate nitrogen kicks the lawn out of winter dormancy and establishes the dense growth that crowds out weeds and moss. Apply too early and the fertilizer just leaches into groundwater; apply too late and you've already missed the best growth window.
Summer maintenance, different needs
Summer fertilization is a lighter, more targeted job. Heat-stressed lawns don't want the high-nitrogen products that work in spring — those push growth that the lawn can't sustain in dry weather. We use slow-release products and apply at lower rates through summer, with the goal of maintaining health rather than pushing growth. For more on what summer-stressed lawns actually need, see our summer brown lawn guide.
Fall fertilization, the most important window
The single most important fertilization window of the year on Vancouver Island is fall. From mid-September through October, the grass is putting energy into root development rather than top growth. A higher-potassium fall product strengthens roots, builds winter hardiness, and sets up a stronger spring. Most homeowners skip the fall feed; pros never do.
Our fertilization timing guide walks through the seasonal calendar in detail.
Why granular, not spray
We apply granular fertilizer only — no liquid sprays. The reasons are practical: granular products are more controllable (you see exactly where it's been applied), don't drift onto neighbours' properties or pets, can be timed precisely for activation by rainfall, and don't carry the regulatory issues of chemical spray applications. We're not licensed for chemical sprays and we don't try to be — granular work is a different scope and it's what we do.
What we apply
- Spring starter fertilizer (balanced, moderate nitrogen)
- Summer slow-release maintenance products
- Fall winterizer (higher potassium, root-focused)
- Granular lime for soil pH correction
- Post-aeration fertilizer for renovation projects
- Iron supplementation for deep green colour
Lime application where the soil needs it
Coastal BC soils are typically acidic — naturally, because of the rainfall, the conifer needles, and the underlying geology. Slightly acidic soil is fine for grass, but very acidic soil suppresses turf vigour and favours moss. Granular lime application corrects soil pH gradually over a season or two. We test and apply lime as needed, especially on properties with persistent moss problems.
For more on the moss-and-pH connection, see our lawn lime application guide.
What we don't do
Chemical sprays of any kind. No iron sulphate sprays, no herbicides, no chemical moss kills. Granular work and physical renovation are inside our scope; chemical work isn't. The homeowner can handle chemical applications themselves or hire a licensed applicator separately.