How to Make Hybrid Poplars Grow Faster

Select a location for planting hybrid poplars that receives full sun. The rapid growth of hybrid poplars is inhibited when the trees are planted in shaded areas. Allow spacing for each tree of up to 15 feet by 15 feet if trees will be left in the location for 20 years or more.

Collect a soil sample and have it analyzed by a local extension office to determine the nitrogen content. Often there will be sufficient nitrogen to carry the newly planted tree for the first year or so. However, applications of nitrogen-rich fertilizer may be required in amounts ranging from 50 to 150 pounds per acre depending on the results of the soil test.

Choose planting locations with loamy soil for good drainage. Amend hard-packed soils such as heavy clay with humus or fine wood mulch to prevent water collection around the roots. Avoid planting areas that are susceptible to flooding or frequent standing water.

Plant hybrid poplar cuttings to establish new trees. Select a 6- to 8-inch limb cutting from an existing tree or purchase cuttings. Clip the buds from the base of the cutting with pruners along the lower 2 to 3 inches. Push the cutting into the soil at least 2 to 3 inches and to a point just below a bud, with the buds on the cutting pointing up.

Provide enough water for the hybrid poplars, especially during the first two years of growth. Supplement moisture between natural rainfall and snowfall by hand-watering with a hose or bucket. Provide enough water to keep the soil moist

Eliminate weeds and grass around hybrid poplars that can slow growth and even kill the trees over time. Control unwanted vegetation with glyphosate herbicide applied with a hand held tank sprayer. Use 1 to 2 ounces of glyphosate per gallon of water to achieve a solution that will kill weeds and grass around the trees.