Conifers can be difficult to propagate vegetatively. Even if they root freely, it tends to take a while. In the glasshouse there is an old specimen of Agathis robusta, but it’s in poor condition. The trees main stem was cut down to around 40cm, the plant is just a stump with some young shoots.
This plant is unlikely to form a new leader and grow into a strong tree. Because of this it would be good to propagate it. The fresh growth lends itself well to cuttings, so today some were taken. All the cuttings are tips for maximum rooting potential. Cuttings are four nodes long, dipped in rooting hormone, potted nine per 11cm pot. Photos below.
Agathis robusta is a large (50m) evergreen conifer. Agathis is a genus in the Auricariaceae family, British readers will know Araucaria araucana (monkey puzzle tree) as it is a commonly cultivated family member. A. robusta grows in Queensland and has two known populations, its uncommon in cultivation. Hopefully the cuttings take as this is a great species to have. Probably more use in the Tropical Australia section than the glasshouse though. A full sized tree below.