Every spring, the same questions start coming in from Nanaimo and Lantzville homeowners — and most of them boil down to timing. Is it too late to aerate? Should I fertilize now or wait? Can I still patch those bare spots before summer? The coastal climate here on Vancouver Island makes the window feel narrow, and it kind of is — but it's not as small as people worry. Here are the questions we hear most in May, answered straight.
Is it too late to aerate my lawn in May?
No — but you're approaching the end of the spring window. Core aeration is most effective when grass is actively growing and can fill in the plugged holes quickly. On Vancouver Island, that active growth window runs from late March through May. In Nanaimo and Lantzville, where the ground warms up early thanks to our coastal climate, a May aeration still gives roots a solid 6–8 weeks of recovery before the summer dry spell sets in.
By June, the ground starts to firm up and compact again, and air temperatures push grass into a slower growth mode. The plugs still help, but the lawn doesn't fill them in as fast. So if you've been meaning to aerate — do it this week or next. Don't wait until after the May long weekend.
When should I fertilize my Nanaimo lawn in spring?
The timing sweet spot for a first spring fertilization on Vancouver Island is late April through mid-May, once the grass is clearly growing and pushing new shoots but before temperatures climb into the mid-20s. Apply too early and the grass can't fully use the nutrients; apply in hot weather and you risk burning shallow root zones.
A balanced granular fertilizer — something in the 20-4-8 range or a dedicated spring lawn formula from your local garden centre — applied now in May will fuel steady green growth through June. If you've applied lime this spring, leave 2–3 weeks between the lime and the fertilizer so neither interferes with the other's availability in the soil.
WCL applies granular fertilizer — that's fine, it's not a regulated spray product. What we don't apply are chemical sprays like iron sulphate, herbicides, or pesticides. Those require a licensed applicator and are the homeowner's call.
My lawn still has bare patches — can I overseed in May?
Yes, but act quickly and plan for consistent watering. Spring overseeding works well on Vancouver Island through mid-May. After that, new seedlings germinate into rising temperatures right at the time when Nanaimo water restrictions may be tightening — a tough combination. The seed needs moisture every day for the first two to three weeks, and if that falls in July, you're in trouble.
For patches you can manage now: scratch the surface with a rake to expose bare soil, apply perennial ryegrass seed at 35–50g per square metre, and top-dress with a thin layer of compost or topsoil to hold moisture around the seeds. Water daily until germination is established. If the patches are large or you're not confident you can water consistently, September is the better window — cooler temperatures and fall rains do most of the work for you.
Should I leave grass clippings on the lawn or bag them?
Leave them. This is called grasscycling, and it's one of the most underrated things you can do for your lawn here on Vancouver Island. Clippings are 85% water and break down quickly, returning nitrogen directly to the soil. Over a full season, grasscycling can reduce your fertilizer needs by 20–25%. The soil biology in Nanaimo and Lantzville lawns handles clippings easily — there's nothing dramatic happening at the surface, they just disappear.
The caveat is that this only works when you're mowing on a regular schedule — every 5–7 days in spring — and cutting no more than one-third of the blade per pass. If you let the lawn get long and then cut off four inches in one go, the thick mat of clippings won't break down fast enough and can smother the turf. Keep up with the mowing, and the clippings look after themselves.
When do Nanaimo water restrictions start, and how should I prepare?
Nanaimo typically moves into Stage 1 restrictions in June, depending on reservoir levels — and in a dry year, Stage 2 can arrive by early July. Stage 1 usually allows hand-held watering and scheduled sprinkler use; Stage 2 limits the days and bans overhead irrigation during daylight hours. Parksville and Qualicum Beach areas operate under different authorities with their own restriction schedules, so if you're not on Nanaimo city water, check with your local system.
The prep you can do right now: raise your mowing height to 3 inches or higher (taller grass shades roots and reduces moisture loss), complete your spring aeration if you haven't already, and shift your watering to deep, infrequent sessions — 2–3 times per week, 20–30 minutes per zone — rather than shallow daily watering. Deep watering trains roots to grow downward, and a lawn with deep roots handles restriction stages far better than a shallow-rooted one that's been babied with daily light watering.
My lawn has moss — is it too late to treat it this spring?
The prime spray window for moss treatment — applying iron sulphate or a similar product — runs from March to early April when moss is actively growing and most vulnerable. By May, the moss has typically browned off or thinned with spring grass growth, which can make it look like the problem has resolved. It hasn't. The spores are still there, the underlying causes (shade, compaction, poor drainage, acidic soil) haven't changed, and it will be back come fall.
If you have significant moss, start planning for a September treatment cycle. That's when conditions warm again after summer, moss resumes active growth, and grass seed establishes well with the fall rains behind it. WCL can handle the physical work around a moss treatment — dethatching, raking out dead material, aerating compacted spots, overseeding thin areas — timed in coordination with the spray step. The spray itself is the homeowner's responsibility to apply, since that requires a licensed product application. We do everything else.