Top Dressing for Croquet Lawns

Top dressing can be applied during the playing season to address localised dips without disrupting play. A light dressing of around 2mm of sand can be used to gradually level problem areas. If mowing at 5mm, this thin layer won't smother the grass. After about a week, another 2mm layer can be applied, and the process can continue until the dip is filled. This method is effective for minor levelling, and reseeding is usually unnecessary.
For this purpose, I recommend round-grained soft sand (commonly known as builder's sand), which is cost-effective. 

Benefits and Best Practices
Top dressing enhances the flatness of the croquet lawn and can be combined with seeding and fertilising for improved results. Using pure sand is advantageous because it flows easily, making application simple. However, sharp sand should be avoided, as it can compact into an impervious layer.
For thicker applications, such as significant levelling work, a sand/loam mix (typically 70/30 or 60/40) is recommended to provide better structure. It's crucial to keep the material dry, as damp top dressing can become lumpy and difficult to spread evenly.
Builder's sand is widely available and affordable, reducing transportation costs. If a sand/loam mix is required, it can be sourced from specialist suppliers at approximately £30–£60 per tonne (for bulk orders of 10 tonnes or more). Costs vary based on delivery distance.
When to Apply Top Dressing

• Best Time: Autumn – This allows the grass several months to recover, and if seeding is done beforehand, seedlings have time to establish.
• Avoid: Spring – Thick layers can inhibit grass recovery, particularly in dry conditions. If applying in spring, keep the layer thin.

Application Rates
The typical application rate is between 2 to 5 tonnes per lawn (2 to 7.5 cubic meters). The method used at Letchworth and Newport Croquet Clubs is demonstrated in the accompanying video.
By following these guidelines, you can maintain a smooth, well-levelled croquet lawn while minimising disruption to play.