Plant your Tabebuia in a location that matches the tree's sunlight and soil requirements. Look for a sunny spot in your garden or home landscape that receives at least six, but preferably eight, hours of direct sunlight each day. Choose a location that also offers nutrient-rich soil with good drainage.
Dig a planting hole for your Tabebuia tree that is two times as wide as its nursery container; the depth of the hole should match the height of the tree's container. Mix two large shovelfuls of peat moss and one shovelful of perlite into the displaced soil to aid aeration and drainage.
Position the Tabebuia tree in its planting hole. Add some of the displaced, amended soil to the bottom of the hole, if necessary, to ensure that the tree is planted at the same height it was growing in its nursery container. Push half of the amended soil back into the hole and pack it around the roots of your tree. Add the remaining amended soil and firm it down around the Tabebuia with the palms of your hands.
Provide your Tabebuia with 1 to 2 gallons of water immediately after planting to ensure that the soil surrounding the tree's roots is thoroughly moistened. Continue to water the Tabebuia once a week, in the absence of rain, to maintain consistently moist soil. Reduce the frequency of watering in the cooler winter months because the tree is not actively growing and does not need as much irrigation. Allow the top 1 inch of soil to dry to the touch between watering.
Fertilize the Tabebuia with a specially formulated flowering tree fertilizer twice each growing season to facilitate healthier growth. Apply the first fertilizer application in the early spring, as soon as new growth is observed. Apply the second fertilizer application in early June. Follow the application directions on the fertilizer label to ensure successful fertilization.