When to Fertilise Your Lawn in NZ: A Beginner’s Guide
If you’re new to lawn care, fertilising can feel like one of those things where you’re not sure when, how often, or what to use. The basics are simpler than they look. There are two main feeding seasons in a NZ, spring and autumn, and getting it right is the difference between an average lawn and a really good one.
The two main feeding seasons
Spring (September, October, November) is when your lawn is growing hardest. Soil temperatures are rising and the grass wants to put on new growth. Spring is the time for higher-nitrogen feeds to support that push. NZLA All Seasons N+ is the product to use here, applied two or three times across the spring.
Autumn (March, May) is the other main feeding window. The lawn is preparing for winter and building reserves rather than chasing fast growth. NZLA All Seasons is the product for autumn applications, applied once in late March and again in early May.
That’s the core programme for most NZ home lawns. Five granular applications across the year, three in spring and two in autumn. Apply at 2 kg per 100 m² and water in with 5 to 7 mm of irrigation within 24 hours.
What about summer and winter?
In summer, the lawn is often heat-stressed, particularly in inland regions. Adding heavy fertiliser to a stressed lawn does more harm than good. The November N+ application carries through into early summer, and after that the focus shifts to foliar feeds and wetting agents to keep the lawn ticking over without pushing growth into the heat.
In winter, soil temperatures drop too low for granular fertiliser to release effectively. The slow-release coating needs warmth to break down, so in cool soil the granules sit there waiting for spring rather than feeding the lawn. Winter feeding shifts to foliar applications, which go straight into the leaf and bypass the cold soil.
Why two products instead of one?
NZLA All Seasons (21-1-16 with 5% iron) and All Seasons N+ (higher nitrogen formulation) cover different jobs. N+ has the extra nitrogen for the spring growth push when the lawn is actively bulking up. All Seasons has the more balanced nutrient ratio suited to maintenance feeding through autumn and other times when steady growth is what you want.
This pattern mirrors what professional turf managers do and follows the NZLA Application Guide on the website. Following the same pattern at home delivers the same kind of results.
Common mistakes to avoid
Don’t fertilise a stressed lawn. If the lawn is suffering from drought, heat or disease, wait until conditions improve before feeding. Pushing growth into a struggling lawn makes the stress worse.
Don’t apply heavy nitrogen heading into deep winter. Soft growth from late-autumn nitrogen invites fusarium and other cool-season disease.
Stick to label rates. More isn’t better. The lawn can only take up so much in one application, and excess gets wasted or causes burn.
Where to go next
The NZLA Application Guide on the website has the full week-by-week programme including the foliar feeds and biostimulants that run between the granular applications. Worth a look once you’ve got the basic granular rhythm down and want to take the lawn up another level.
Frequently asked questions
How often should I fertilise my lawn?
Five granular applications across the year for a typical NZ home lawn: three in spring (September, October, November) and two in autumn (March, May). The NZLA Application Guide has the week-by-week detail.
What’s the best lawn fertiliser for beginners?
NZLA All Seasons N+ for spring and NZLA All Seasons for autumn cover the main programme. Both are slow-release granulars that are straightforward to apply with a standard spreader.
Can I just use one fertiliser all year?
You can, but the results aren’t as strong. The lawn wants more nitrogen in spring (when it’s growing hard) and less in autumn (when it’s preparing for winter). Two products matched to the two seasons gives a noticeably better result.
When can I start fertilising a new lawn?
Wait until the new lawn has been mown three times and the grass has a strong even cover. Then transition to the standard programme. Before that, NZLA Starter at sowing and Liquid Starter through the establishment phase cover the new lawn’s needs.
Will fertiliser burn my lawn?
At label rate with proper watering-in, no. Burn risk goes up if you over-apply, skip the watering-in, or fertilise a heat-stressed lawn. Stick to 2 kg per 100 m² and water in straight after.
How long before I see results?
Granular slow-release usually shows colour and growth response within two to three weeks. Faster in warm soil, slower in cool. Foliar feeds work faster, a few days for nitrogen and iron response.
What about clover and weeds, do they get fertilised too?
Yes, fertiliser feeds whatever is there. The way to favour grass over weeds is through a dense well-fed lawn that outcompetes weeds rather than trying to feed only the grass.
Comments
0