Can you put too much mulch around a tree?

Yes, mulch deeper than 4 inches is too much. Penn State Extension keeps mulch around trees 2–4 inches deep.

Mulch Calculator

Mulch weighs about 450–620 lb per cubic yard (shredded wood, as sold). Enter the bed's length, width and depth below to get cubic yards, bags and cost for your flower bed.

Shape

Area

Length ft

Width ft

Count

Depth in

Tape readings work: 10' 6", 10½. Sloped? Type the depth as 2-6. Other material? Use the cubic yard calculator.

Order

1 cubic yard to order

rounded up to the nearest ¼ yd³

Solid: exact 0.93 yd³. Dashed: what you order, 1 yd³ (rounded up). Person: 6 ft, for scale.

Weight: 0.23–0.31 tons (shredded wood, as sold)
Bags: 13 × 2 cu ft
Cost: $25–$50

Round up to your supplier's step. It settles as it waters in — no published rate, so plan a top-up.

Details: exact volume, bags vs bulk, order sheet

Exact 0.93 yd³ · 25 ft³ · 0.71 m³

At 3 in deep, 1 yd³ covers 108 ft².

You need 1 cubic yard of mulch ≈ 0.23–0.31 tons (shredded wood, as sold) ≈ 13 bags of 2 cu ft.

Other bag sizes: 9 × 3 cu ft · 17 × 1.5 cu ft

Bags vs bulk: price per 2 cu ft bag, $

Order sheet for your supplier

Mulch weight: shredded wood, as sold (NRAES-54 (Cornell), Caterpillar). Cost: reference range, shredded hardwood, before delivery (Lawn Love, ZonedGarden, 2026); local prices vary.

Result looks wrong? Tell us

Mulch depth for beds and trees

Mulch goes 2–3 inches deep for most beds and never more than 4 inches (Mississippi State, UF/IFAS and Penn State Extension).

Around seedlings, UF/IFAS uses a 1-inch layer. At 3 inches, one cubic yard of mulch covers 108 square feet — the math for any depth is on square feet to cubic yards.

Depth	ft² per yd³	ft² per 2 cu ft bag
1 in	324	24
2 in	162	12
3 in	108	8
4 in	81	6

Mulch bags per yard

A cubic yard of mulch is 13.5 bags of 2 cu ft — buy 14, or 9 bags of 3 cu ft. Bags per yard = 27 ÷ the cubic feet on the bag.

Bag size	Exact bags per yd³	Bags to buy
1.5 cu ft	18	18
2 cu ft	13.5	14
3 cu ft	9	9

Mulch weighs about 450–620 lb per cubic yard as shredded wood, as sold, or about a quarter ton. Wet mulch weighs more; no published source measures by how much.

Mulch: weight, bags and price per cubic yard
Material	lb per yd³	tons per yd³	Bags	$ per yd³
Mulch	450–620	0.23–0.31	2 cu ft, 3 cu ft, 1.5 cu ft	$25–$50

Weight basis: mulch shredded wood, as sold. Prices are reference ranges from dated cost guides and supplier lists (updated September 2026); local prices vary. Sources: NRAES-54 (Cornell); Caterpillar; Mississippi State University Extension; UF/IFAS Gardening Solutions; Penn State Extension; Lawn Love; ZonedGarden.

Mulch worked example: 20 × 5 ft flower bed

A 20 × 5 ft flower bed mulched 3 inches deep takes 1 cubic yard, or 13 bags of 2 cu ft.

Area20 ft × 5 ft100 ft²
Volume100 ft² × 3 in ÷ 1225 ft³
Cubic yards25 ft³ ÷ 270.93 yd³
Ordernext ¼ yard up1 yd³
Bags25 ft³ ÷ 2 ft³13 bags of 2 cu ft

Mulch calculator FAQ

Can you put too much mulch around a tree?: Yes, mulch deeper than 4 inches is too much. Penn State Extension keeps mulch around trees 2–4 inches deep.
How much does a yard of mulch cost?: A yard of mulch costs about $25–$50 for shredded hardwood, before delivery (Lawn Love, ZonedGarden, 2026). Delivery is extra and local prices vary.