Poplar trees are large, fast-growing trees that require proper nutrition and watering to grow. Gardeners who maintain a healthy balance of soil, nutrients and water are able to produce well-grown trees with a rich green lumber that can be later harvested for carpentry. Keeping the naturally green color in poplar is done by giving the tree considerable nutrients while growing, stopping the growth of resource-stealing weeds, and finishing the harvest wood with clear finishes that won't stain the wood.
Plant the tree in full sunlight with a moist loam soil. Keep the plant isolated by at least 4 feet to achieve proper root growth. Backfill the planting hole with the displaced soil.
Water the poplar tree regularly after planting to eliminate air pockets around the roots.
Fertilize the tree every other week with an NPK of 10-10-10 to provide the tree with the greatest amount of nutrients.
Water the tree once every week during periods when rainfall is less than 1 inch. This will help keep the tree's trunk from rotting and fight against aging.
Mulch with wood chips until there is at least 3 inches covering the root zone the following spring to dissuade infestation by weeds and insects.
Spray the growing tree once a year in early summer with insecticide to prevent damage to the tree from invading pests.
Finish harvested lumber with 12 oz. of gloss lacquer, being careful not to apply more than a few coats, which will damage the color.