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When to Fertilize Grass After Seeding

grass seed growing

Seeding a new section of grass is a great way to invest in your garden. Like most things in their infancy, newly seeded grass must be cared for carefully to help it grow into a luscious mature lawn. Part of the process includes knowing when to fertilize grass after seeding it, which can depend on a variety of factors including; the type of grass, time of year as well your climate.

It’s recommended you use a pre-turf fertilizer, this will help your new lawn get the best possible growth. This should be done before you have even planted any new grass seed.

Quick definitions:

  • Starter Fertilizer/Pre-Turf Fertilizer: this is a fertilizer that is applied to the ground before you apply the new lawn seed to promote new growth.
  • Germination: the process of something coming into existence and developing.

How Soon Can You Fertilize New Grass

The years four seasons present their own unique challenges and climate conditions, which is why you must consider the time of year that you sowed your lawn seed when understanding the optimal time to fertilize your new grass.


After long dark winters spring is the most promising time of the year, where nature bursts into color and new life sprouts. This is an incredibly active time for new grass. Seeding early in spring is recommended, allowing plenty of time for them to germinate and mature before summers hot weather arrives.

When to Fertilize: if you used a pre-turfing fertilizer wait 6 weeks if you didn’t feed after 4 weeks of laying the new lawn.


The season that families spend the most time in the garden, it’s less of a traditional time to sow lawn seeds as the mild weather has well and truly gone. That said, Summer is a time that warm weather grasses can thrive such as Bermuda and St. Augustine. 

When to Fertilize: if you chose not to apply a pre-turfing fertilizer, apply a spring-summer feed around 5 weeks after laying your new lawn. In summers high temperatures, giving your new lawn enough water is key to its success.

For help choosing a great summer fertilizer, read our summer lawn fertilizer round-up. 


One of the most beautiful seasons Autumn is a time where you get the benefit of warm soil as a knock-on effect from summer with now mild weather. This is a time where turf will be working hard to affirm its roots.

When to Fertilize: if you used pre-turfing fertilizer it will be enough to keep your lawn going. If not, to help the roots use a low nitrogen, autumn-winter lawn feed around 5 weeks. Choosing a fertilizer low in nitrogen is key to prevent weak leaves from growing.


Winter is a very beautiful time of year for gardens and one that’s still possible to lay new turf, but don’t expect any quick growth. Due to the nature of the season, there’s likely to be very little visual progression with your new lawn.

When to Fertilize: Wait a few months until spring starts to kick in, from March on you can use a spring-summer fertilizer to promote the growth of your new lawn once temperatures begin to rise. After this routinely feed your lawn every 4-6 weeks.

How Often to Fertilize New Grass

The transition from starting a new lawn, to getting into a fertilizing routine is where many get confused. A start fertilizer should only be applied during the preliminary stages of forming your new lawn. After the new seeds have germinated and have been given enough nutrients to become grass, there’s no need to give your lawn starter or pre-turf fertilizer.

You are now looking to source a fertilizer that’s suitable for your grass as well as your climate and vegetation conditions. At this stage, you can get into a lawn feeding schedule that matches your ambition to promote the growth of your new lawn. If you’re looking to source a great lawn fertilizer, why not check our list of the best lawn fertilizers.

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