To my embarrassment after spending lots of time preparing the poor 'soil' at our house in Mooloolaba QLD, the Jacaranda tree I planted many months ago is still not flourishing! Our block is very sandy / clayey with not much organic matter. I think the hole I dug was big enough & I used plenty of Garden Mate before & after planting. I backfilled with nursery recommended garden soil improver / compost. It's lost all it's lower branches & I'm now thinking I should cut it back to hopefully encourage new growth or else it may be doomed to fail. My thoughts are that it's a risk worth taking because it will probably never come good? If I cut it back, how much should I take off - 1/3? 1/2? 2/3? Thank You