This young tree has lost all the top branches and now only has a tiny bit of greenery at the top and all this new growth from the ground level. I'm a bit lost as to how to manage it properly. I am in Queensland, Australia.
Your tree needs to have the lower suckers removed and to be pruned when it's dormant. Here are some tips:
I planted it twelve years ago, on the tenth year it produced two flowers only. Then on the twelfth year I have two solitary flowers again. Every year I have a beautiful green foliage,
Likely, it has to do with soil nutrient content. Make sure to test your soils for excessive nitrogen. This will prevent flowering. If a soil test reveals that you have too much nitrogen, then you can offset with phosphorus and potassium.
Here are some articles that will help:
Outside of this... Patience is key. It is right in the range of flowering age.
jacaranda tree is just over a year old. We mostly kept it indoors over the winter as we are based in the UK. Putting it out for sun light when available and a little rain here and there. It started to smell a strong odor so we put it out side and now it's leaves are turning brown and dropping off just at the turn of spring. It still has fresh growth at the top currently but would appreciate some advise as it was a thoughtful gift and we would hate to lose it.
Yellowing leaves is often due to over or underwatering. The soil looks overly wet right in the photo, so that might be what is going on. Also, in one photo it looks like a couple stems have insect pests, but I couldn't zoom enough to tell if it is aphids or scale. Plus, it looks like there is some tunneling on the main stem. Neem oil will help with those problems.
We are 2 miles from the ocean in full sunlight. Lawn watered the same last 10 years. Always lush blooms. Tree topped last November.
I am sorry, but we do not make referrals. But your local extension center might. Here is how to contact them and an article about your tree:
My jacaranda tree which is only a year old, the leaves are Turning brown from the tips of the leaves and the whole tree has a yellow look to it. I do not believe it is heat scorch because the days have been cool. I have sprayed the tree with pesticide because ants were all over it. Any ideas and tips would be much appreciated.
Depending on the type of pesticide that you chose, it could be sun scorch! Many oil based pesticides caution in the instructions that the product should not be used when the sun is out, or only use when cloudy.
the leaves are a yellowish green in colour
Unfortunately, your photos did not come through. I am unable to see the damage. I would not worry until Spring. If you do not see new growth by then, the tree may have an issue. Otherwise, it could be general stress.