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.
The end of summer marks the start of marri flowering season (Corymbia calophylla). You can see their pretty white or pink flowers throughout Perth and the south west from now through autumn. Many birds and insects depend on the nectar and pollen of marri during the long flowering season. 
“Street trees are an important part of every community and are one of the City of Stirling’s most important assets. The City has approximately 63,000 street trees but these only cover around one third of all street verges.” – City of Stirling
There are many benefits to planting trees in our cities. Due to all the heat absorbing surfaces like concrete and roads, cities are warmer than surrounding rural areas. Trees and other vegetated areas in our cities help lower temperatures counteracting this “urban heat island effect.” As well as shade, the evaporation of water through the leaves of plants into the atmosphere causes the cooling. A shady street is pleasant for walking and prettier to look at. Trees also attract bird and insect life, much needed since so much of their bushland homes are cleared for housing and development.
The flooded gum (Eucalyptus rudis) is Perth’s river gum, growing along our rivers, lakes and water courses. Its range extends north to Geraldton and into the south-west of WA. These beautiful trees surround Lake Gwelup and as the water level ebbs and flows, they often stand in water in winter and spring. With this inundation from winter rains they flower and this month the first flowers are starting to open.
I recently identified limestone mallee (Eucalyptus petrensis) growing in a bushland reserve near my house. It took me a while to identify, but I’m not alone there. Limestone mallee was first collected in 1972 but not named until 1993 because it was confused with limestone marlock (Eucalyptus decipiens) . Eucalyptus petrensis grows in shallow soil on limestone, so is found in a “limited coastal distribution on the first and second seaward limestone outcrops” . The strip of bush where I found limestone mallee is very degraded but has been planted in the past. I’m not sure if these trees are original or part of a revegetation project. A stand of naturally occurring limestone mallee grows at Bold Park.