1.   As soon as the snow is gone, spread a two-inch layer of compost over the root zones and prune off anything damaged.

2.   A layer of plywood or mulch spread around the root zone can reduce root death from heavy equipment.

3.   Hemlocks like moist cool root zones, so mulch underneath and water during droughts.

4.   His big pivot irrigator stops spraying when neutron probes show that moisture has seeped below the root zone.

5.   Most other trees and shrubs, however, need air in their root zone and should not be used where flooding is likely.

6.   Mulch the root zone.

7.   Mulch trees and shrubs throughout the root zone, which can extend well beyond the branch line.

8.   The drip system uses perforated tubes to deliver water directly to the root zone, in contrast with the old method of flooding fields.

9.   The systemic is absorbed by the grass and moves down into the root zone, completing the kill.

10.   Their tunnels, which may extend three to four feet down, improve drainage and help the movement of oxygen and carbon dioxide in the root zone.