KissMyGrass Autumn & Winter Lawn Fertiliser 6.5.10 + Fe + Mg
KissMyGrass Autumn & Winter Lawn Fertiliser is a specialist autumn and winter lawn feed formulated to strengthen and support lawns through the colder months. With a lower nitrogen and higher potassium content, it helps maintain a healthy lawn without encouraging excessive growth, while added iron and magnesium help promote a rich green colour. Nutrients are released over a 6-8 week period to help keep lawns in excellent condition throughout autumn and winter.
- Helps strengthen lawns for colder, wetter conditions
- Doesn't encourage excessive growth during winter
- Added iron and magnesium for a deep green lawn colour
- Nutrients released gradually over 6-8 weeks
- Apply from September to February
- Contains NPK 6.5.10 + 2% Fe + 1% Mg
- Apply at 35g/m². 20kg covers up to 575m²
This product is formulated for established lawns. If sowing new grass seed, wait 7-14 days after watering in the fertiliser.
KissMyGrass Autumn & Winter Lawn Fertiliser contains:
- 6% Nitrogen (N) – supports healthy grass without encouraging excessive growth.
- 5% Phosphorus (P) – supports root development and nutrient uptake.
- 10% Potassium (K) – helps strengthen grass and improve resilience through winter.
- 2% Iron (Fe) – enhances lawn colour and promotes a deeper green appearance.
- 1% Magnesium (Mg) – supports healthy colour and overall lawn condition.
We do not recommend using this fertiliser at the time of seeding.
This product is formulated for established lawns and is not a dedicated pre-seeding fertiliser.
If you are planning to sow new grass seed, allow 7-14 days between applying this fertiliser and seeding. For the best establishment and early growth, we recommend using a specialist pre-seeding fertiliser designed for new lawns.
- For maximum effect and to improve nutrient uptake from granular fertilisers, apply liquid seaweed every 2-3 weeks to improve soil biology and structure over time
- For accurate and easy application Boston Seeds recommends using a spreader
Why should I use an autumn and winter lawn fertiliser?
Lawns have different nutritional requirements during autumn and winter than they do during spring and summer.
Spring & Summer lawn fertiliser focuses on growth. You want plenty of nitrogen to drive new grass growth during the main growing season.
Autumn & Winter lawn fertiliser focuses on strength. You want less nitrogen and more potassium to help the lawn cope with cold, wet, frosty conditions without producing lots of vulnerable new growth.
During the colder months, grass growth naturally slows, so applying a high-nitrogen lawn fertiliser can encourage soft growth that is more vulnerable to frost, disease and winter stress.
KissMyGrass Autumn & Winter Lawn Fertiliser is specifically formulated with a lower nitrogen and higher potassium content (6.5.10 NPK) to support a stronger, healthier lawn without promoting excessive growth. This helps improve lawn resilience through colder, wetter conditions while maintaining good colour and condition throughout autumn and winter.
Can I use granular fertiliser when sowing a new lawn?
We do not recommend using this fertiliser at the time of seeding.
This product is formulated for established lawns and is not a dedicated pre-seeding fertiliser.
If you are planning to sow new grass seed, allow 7-14 days between applying this fertiliser and seeding. For the best establishment and early growth, we recommend using a specialist pre-seeding fertiliser designed for new lawns.
When should I apply KissMyGrass Autumn & Winter Lawn Fertiliser?
Apply from September to February. This coincides with the period when grass growth naturally slows and lawns benefit from a fertiliser that focuses on strength, resilience and colour rather than rapid growth.
How long does Autumn & Winter Lawn Fertiliser last?
The nutrients are released gradually over approximately 6 to 8 weeks, helping to provide continued support throughout the autumn and winter seasons.
What ingredients make a good Autumn Winter Lawn Feed?
- High Potassium (K) – helps strengthen grass and improve resilience to winter weather, frost and other seasonal stresses.
- Mid Phosphorus (P) – supports root development and nutrient uptake.
- Low Nitrogen (N) – helps maintain healthy grass without encouraging excessive growth during the colder months.
- Some Iron (Fe) – helps maintain a rich green lawn colour throughout autumn and winter.
- Some Magnesium (Mg) – supports healthy leaf colour and works alongside iron to promote a greener, healthier-looking lawn.
This autumn and winter formulation is designed to support lawn strength, colour and overall condition during the colder months.
Delivery Information
We’re proud to offer fast and reliable delivery. Please check the delivery label on each product page for specific delivery timeframes.
Items Marked as Next Day Delivery
- Orders placed before 2pm (Mon–Fri) will be dispatched the same working day with delivery the next working day
- Orders placed after 2pm are dispatched the next working day
- Orders placed after 2pm Friday are dispatched on Monday for Tuesday delivery (excluding Bank Holidays)
- Orders for Saturday delivery must be placed by 2pm Friday
Delivery Combinations
If your order contains a combination of next day and non-next day products, please note only the products marked next day will be delivered next day. The remainder of your order will be delivered within the timescales indicated.
Orders are sent via DHL, DPD, DX, Evri and Royal Mail, plus pallet networks for orders of approximately 100kg+.
| Delivery location | Excl. VAT | Incl. VAT |
| UK inc. Islands & Channel Islands up to 2kg (seed only) | £3.33 | £3.99 |
| Standard UK Mainland Delivery | £4.99 | £5.99 |
| Saturday (England & Wales) up to 30kg* (Orders must be placed by 2pm Friday) | £12.50 | £15.00 |
| Scottish Highlands and Islands up to 30kg* | £14.00 | £16.80 |
| Isle of Man, Isles of Scilly up to 30kg* | £17.00 | £20.40 |
| Channel Islands up to 30kg* | £12.00 | £14.40 |
*please enquire for orders over 30kg to these locations.
Collections
Customers are welcome to purchase items marked as next day delivery in person from our office and distribution centre at:
Manor Road
Kirton
Boston
PE20 1PH
Additional Information
- Orders over 100kg will normally be delivered on a pallet unless specified otherwise.
- Standard delivery takes place between the hours of 8am and 6pm, Monday to Friday.
- Orders containing multiple items may be delivered separately via multiple couriers.
- Unfortunately, we are unable to deliver to Northern Ireland or Europe.
***Please Note
Dates and indications for delivery are approximate and we cannot guarantee or be held responsible for delays in delivery dates or times. We do not refund delivery charges for delayed deliveries.
Please order from us with enough lead-time to prevent any loss or disappointment resulting from the delivery date or time. Under no circumstance will we be held responsible for any loss or damage incurred through delay in order fulfilment.
Please check that you have entered the correct delivery address before completing your order as we are unable to change it once processed.
CONTACT US
For any queries relating to your order, please contact [email protected]
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Buy With Confidence
We’re dedicated to making the highest quality, professional outdoor products available to everyone to truly make the most of their outdoor spaces - lawns, gardens, landscapes, equine, sports and agriculture. Trusted by over 200,000 happy customers with a reputation for professional quality, world-class service and outstanding value for everyone, since 2002.
We take quality seriously, supplying products you can trust. Our grass seed is DEFRA-certified for purity and germination, utilising the highest quality cultivars recommended by the Sports Turf Research Institute. Wildflower products are of known UK provenance and flower bulbs are sourced directly from the finest growers in the UK and the Netherlands.
With hundreds of items available for next day delivery, we take pride in getting your order to you quickly and efficiently. Our team of dedicated experts and friendly advisors are here for you when you need them. That’s why you can call us and get straight through to an advisor from 9am-5pm, Monday to Friday, or email us for a rapid response.