ISA Tree Selection and Planting 2

Question 1

What is the MOST critical step when planting a balled-and-burlapped (B&B) tree?

Accepted Answer

Locating the root flare and planting at the correct depth

Answer

Planting with the root flare at or slightly above grade is the most critical step; planting too deep leads to stem girdling, anaerobic conditions, and eventual tree death.

Question 2

What is the recommended width of the planting hole for a new tree installation?

Accepted Answer

Two to three times the diameter of the root ball

Answer

A wide planting hole (2–3× the root ball diameter) loosens surrounding soil and allows roots to expand laterally with less resistance.

Question 3

After placing a balled-and-burlapped tree in the planting hole, the wire basket and burlap should be:

Accepted Answer

Cut away from the top third of the root ball after the tree is positioned

Answer

The top portion of the wire basket and burlap should be cut away after placement to prevent girdling and allow uninhibited root expansion.

Question 4

When planting container-grown trees, circling or girdling roots should be:

Accepted Answer

Straightened, redirected, or removed before planting

Answer

Circling roots will continue to enlarge and can eventually girdle and kill the tree; they must be corrected at the time of planting.

Question 5

What is the recommended mulch depth when mulching around a newly planted tree?

Accepted Answer

2–4 inches

Answer

A 2–4 inch layer of mulch conserves moisture, moderates soil temperature, and suppresses weeds without causing crown rot or oxygen deprivation.

(ISA) ISA Certified Arborist Practice Test

(ISA) ISA Certified Arborist Practice Test

ISA Tree Selection and Planting 2