Choose and buy mulch
Choose a material, account for the mulch already there, and compare bags with a bulk delivery.
Choose for the bed, not just the color
Start by measuring the beds on the satellite map. Keep separate areas when they need different materials or depths. For planted beds, wood chips or bark are a practical starting choice: they cover the soil and gradually break down into organic matter.
This guide covers landscape beds around trees and shrubs. Playgrounds, vegetable beds, and drainage installations have different material requirements.
| Material | Useful when | Tradeoff |
|---|---|---|
| Shredded bark or wood | You want a consistent finish around established plants. | Fine material can mat; check that water reaches the soil. |
| Coarse chips or bark nuggets | A looser, chunkier surface suits the planting. | Large pieces are less convenient around small plants and narrow edges. |
| Arborist chips | You have a larger tree or shrub area and accept mixed texture. | Ask about source, load size, and unwanted plant material; the appearance varies. |
| Stone or gravel | The planting and design call for a mineral surface. | It adds no organic matter and is heavy to move when the bed changes. |
Buy the missing depth, not another full layer
For many bark-mulched landscape beds, 2–3 inches total is a useful starting depth. Coarser materials may call for 3–4 inches; wet sites or fine-textured mulch may need less. Follow the material and planting guidance rather than applying the deepest setting everywhere.
Push the mulch aside in several places and measure from the soil to the top of the existing layer. If the target is 3 inches and 2 inches remain, add 1 inch—not 3 more. Where the bed already has enough, no top-up is needed.
Keep mulch out of contact with trunks and stems. Spread it outward over the bed, not upward into a mound around the tree. Pull back excess material before ordering more.
Compare bags and bulk on the same amount
Here’s a hypothetical 324 sq ft bed. At 3 inches deep from bare soil, it needs 3 cubic yards. If 2 inches of mulch remain and you only add 1 inch, it needs 1 cubic yard. The area has not changed; the depth to add has.
| Job | Bulk volume | 2 cu ft bags | 3 cu ft bags |
|---|---|---|---|
| 1-inch top-up | 1 cu yd | 14 bags | 9 bags |
| 3 inches from bare soil | 3 cu yd | 41 bags | 27 bags |
One cubic yard equals 27 cubic feet, or 13½ two-cubic-foot bags. Since bags are whole packages, you would buy 14. The small remainder comes from rounding; don’t apply the same extra allowance again.
In the mulch calculator, enter the depth you are adding. It does not inspect or subtract the old mulch for you. For beds needing different top-ups, calculate each group separately.
Include delivery and handling in the comparison
Bags are convenient when you have a small order, tight access, or want to work in stages. Bulk becomes worth comparing as the quantity grows, but there is no universal yardage where it is always cheaper.
For the one-yard example, compare 14 × the price per 2 cu ft bag with one bulk yard + delivery + any minimum-order charge. Include tax and pickup costs consistently. Compare the same type and quality of mulch, not premium bark against mixed chips.
- Ask about the drop point. Can the truck reach a suitable surface without blocking access? Where will rain carry loose material?
- Plan the route to the beds. Gates, steps, and a long wheelbarrow run can make bags easier even when bulk costs less.
- Check load limits before pickup. Get the supplier’s estimated weight and compare it with the vehicle or trailer’s rated capacity. A yard of stone is not a yard of wood chips by weight.
Prepare the bed before spreading
Remove weeds, especially established perennial roots. Loosen matted old mulch and check the soil beneath it. Sound, decomposing mulch can stay; remove excess or material that prevents water reaching the soil.
Landscape fabric? Usually skip it beneath organic mulch in planted beds. Decomposing material can support weeds above the fabric, and roots can become tangled in it. Fabric may have a role under a specified stone installation, but it is not a permanent weed-free guarantee.
Check depth again after spreading. Future top-ups should replace what has broken down or moved—not follow a fixed annual order just because the surface color has faded.