Jarrah trees are flowering now throughout Perth, the Hills and into the South-West as far south as Bremer Bay. These majestic trees can grow more than 400 years and cloak themselves in cream blossom every spring.
Hardenbergia comptoniana climbs up this jarrah. Purple winter flowers finished before the jarrah flowers opened in the last couple of weeks.
Scientific name Eucalyptus marginata
Common name Jarrah
Flowers June – January
Bud-cap (operculum) narrow cone
Buds begin to form in summer but don’t mature until the following spring.  The photo above has young buds in May, below are mature buds with flowers opening in November.
Gum nut cup shaped
Old nuts (below) some of which haven’t opened, others were predated by insects
Bark rough and fibrous, grey with red underneath 
Growth habit large tree up to 40m
In coastal areas grows as a mallee to 15m, but in forests grows taller to access restricted light 
This tree (below) was fire damaged many years ago. The original trunk (left) may have decayed over time or was felled, and epicormic shoots grew into new trunks allowing the tree to continue living.
A carnivorous Sundew (Drosera erythrorhiza) grows in winter leaf litter under a stand of jarrah trees
Associated wildlife birds and insects feed on the pollen and nectar, including two butterflies: the Australian Painted Lady and Western Brown. 
A myriad of insects co-evolved with eucalyptus to feed on their leaves, including Red-legged weevils and Sawfly larvae (spitfires).  The jarrah leafminer (Perthida glyphopa) is the larva of a moth. It eats the inside of leaves, leaving brown patches. When mature, the larva cuts a circle of leaf to make a sac and drops to the ground to pupate.
While feeding, leafminer larvae are predated by birds such as pardalotes, thornbills and parrots.  This ensures the tree continues to provide food for all. These leaves (below) have leafminer damage, while a bee collects pollen.
This house was built in my suburb and it was designed around some trees, including a jarrah, behind the metal frame. The paperbark on the left was also kept.
The finished house is beautiful. Opposite the house is a small reserve of remnant bushland with other jarrahs and tuarts, providing a (tiny) corridor of habitat for wildlife like these magpies.
Cultivation easy to grow from seed. Place nuts in a paper bag in a warm spot and the fine seed will be released in a few days. 
Florabase record http://florabase.com/browse/profile/5708
- Powell (2009) Leaf and Branch: Trees and Tall Shrubs of Perth (2nd ed) Perth: DEC.
- Barrett & Tay (2005) Perth Plants. Perth: BGPA.
- French & Nicolle (1997) The Special Eucalypts of Perth and the South-West. Perth: F&N Publications.
- Wrigley & Fagg (1998) Australian Native Plants: Propagation, Cultivation and use in Landscaping (4th ed) Sydney: Reed New Holland.