David Robson says planting the root ball this way will improve growth.
罗宾逊表示，通过这个方式种植后将加速植物生长。
DAVID ROBSON: "[If] some shrubs get too tall, you start losing their ability to produce good flowers."
假如一些灌木长的太高，可能就会开始丧失开花的能力。
But David Robson of the University of Illinois Extension says more and more plants are grown in containers.
但是，伊利诺斯推广大学的大卫·罗伯森表示，越来越多的植物被种在容器中。
But David Robson of the University of Illinois Extension says more and more plants are grown in containers.
但是，伊利诺斯推广大学的大卫·罗伯森表示，越来越多的植物被种在容器中。
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