New pink bottle brush gone droopy & pale why ?

Question

Live in Western Australia planted it a week ago had a lot of rain since with a couupf sunny days . Soil sandy & lots of bottle brush in the area

Answer 1

Your plant is suffering from transplant shock, which is sometimes due to poor handling, breaking of the soil rootball, root loss if it was dug from a previous location, or delaying watering and allowing the root ball to dry before planting. Or sometimes it just happens in spite of best handling and watering.
With sandy soil, your challenge will be to keep it watered until it can recover and start to put out new roots and new green growth. Don’t write it off as a loss yet.
I like a ‘soil moisture meter’ to take the guess work out of when to water. Example – https://www.domyown.com/luster-leaf-rapitest-mini-moisture-tester-1810-p-7732.html

I don’t know your resources there, but if you can shoot down to a garden center and get some “Superthrive”, I swear by it to help avoid transplant shock an aid recovery. https://www.domyown.com/superthrive-the-original-vitamin-solution-enhanced-with-kelp-p-9474.html