Qld Blue Couch

Blue couch

Scientific name
Digitaria didactyla

Common name
Blue couch

Other names (PBR name, trademark, breeder code)

Formerly D. swazilandensis (scientific name); Serangoon grass.


Naturalised in Queensland from a heterogenous stock introduced from the Mascarene Islands in the early 1800s. Fine textured turf with blue-green leaves. Leaf sheath length 11.3-14.7 mm, width 1.2-2.2 mm (4th node from tip of stolon) (Data from ´Aussiblue´ Plant Breeder's Rights growing trial). QLD Blue grows well on a wide range of neutral to acid soils; tolerant of very acid soils (pH 5.5 and lower). Seeds prolifically from late spring to early autumn. In South East Queensland, blue couch will invade most other warm-season turfgrasses forming mixed swards and can eventually become the dominant species, particularly under low fertility conditions. Copes with lower levels of fertiliser and insecticide/fungicide inputs than green couch if favorable conditions exist. QLD Blue Couch is slow to recover (by stolon growth) from traffic damage and it does not tolerate MSMA or DSMA herbicide (DAF, no date). QLD Blue Couch is less drought hardy than green couch varieties, but recovers quickly once drought stress is removed. QLD Blue Couch is among the least shade tolerant warm-season turfgrass species. It is tolerant of temporary, though not permanent, waterlogging, but has a low tolerance of salinity (Loch et al., 2013).

Seed is available commercially by seed, but often in very limited and small supplies. 100 grams sows approx. 10m2.

Other comments

In Queensland, QLD Blue is a very dominant turfgrass. You will find QLD Blue couch dominante most turf species, including green couch. Blue couch can be difficult to remove, without selective herbicide which is often not available to the general public (available to industry and qualified persons).



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Available in Sod/turf and seed
Price range $5 - $6
Use Residential and Parks
Suitable climate classification Subtropical and Tropical
Preferred mowing height 6mm - 30mm
Shade tolerance Poor
Wear tolerance Poor
Cold tolerance Poor
Heat tolerance Good
Salinity tolerance Poor
Water requirement Low
Fertiliser requirement Low
Mowing frequency Low
Thatch production Low
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References Read more  
  • Loch, D.S., McMaugh, P. and Scattini, W.J. (2013). A review of Digitaria didactyla Wild., a low-input warm-season turfgrass in Australia: Biology, adaptation and management, International Turfgrass Society Research Journal, Vol. 12, pp. 14.
  • DAF (no date). QLD Blue Couch Technical Descriptor, Former Redlands DPI Technical Notes.

Related Turf Varieties


Digitaria didactyla


Digitaria didactyla