Seed Heads in Lawns

A common problem with new lawns in late spring and early summer is the production of seed heads. Seeding is a natural part of the reproduction cycle. Even though the newer lawn varieties are hybrids with sterile seeds – they will still seed.

Lawn seeds are woody and tough, and the mower tends to leave a lot behind, so a sharp machine is essential.


Causes of Seed Heads

Seed heads are also caused by stress – either lack of water and/or nutrients, or when they are new and do not have a well established root system. Mature lawns which are well looked after seed a lot less.

To determine the cause, check the soil moisture content – dry soil is a tell tale sign – compare with an area where there are no seed heads, often in shaded areas where the evaporation rate is less.Insufficient nutrient levels, particularly trace elements such as iron & manganese, can cause the lawn to produce excessive seed heads. Soils lacking in trace elements can prevent the plant from taking up other nutrients such as Nitrogen, Phosphorous and Potassium, so simply pouring more fertiliser on will not solve the problem.


How to help lessen seed heads

Seeding can be lessened and even stopped if the lawn is fed with a quality fertiliser made for Perth. Fertilisers for Perth have sufficient amounts of trace elements and iron and manganese. Our own, Knights Special Mix (available from our retail outlet at 1 Dellamarta Road Wangara) is a great fertiliser for our coastal sand. Then given a low mow (not scalped). Often, when the turf grows back after this mow  there are noticeably less seed heads.

Also do a water audit and make sure the lawn is getting the minimum 20mls of water per watering session. See

As seed heads are a problem in Spring see our Spring Checklist for more help