The number of bags of mulch you'll need to cover a yard (assuming "yard" refers to a cubic yard of mulch) depends on the size of the bags you buy. Here's the breakdown:

- Most bagged mulch comes in 2 cubic feet per bag.
- One cubic yard is equal to 27 cubic feet (3 x 3 x 3).

Therefore, to cover a yard (one cubic yard) with 2 cubic feet per bag mulch, you'd need:

```
Number of bags = Total volume (cubic yard) / Volume per bag (cubic feet)
Number of bags = 1 cubic yard / 2 cubic feet/bag
Number of bags = 1.5 bags (approximately)
```

Since you can't buy half a bag, you'll realistically need:

- 2 bags of mulch to cover a yard if each bag is 2 cubic feet.

Here are some additional factors to consider:

- Bag size variations: While 2 cubic feet is common, some mulch bags might contain 1.5 cubic feet or even 3 cubic feet. Always check the volume information on the bag you intend to purchase.
- Mulch depth: The recommended depth of mulch application is typically 2-3 inches. If you plan to use a deeper layer, you'll need more bags accordingly.
- Settling: Mulch can settle over time, so you might want to buy a slightly extra bag to account for this.

Here's a tip: It's always better to buy slightly more mulch than you think you'll need to avoid running out in the middle of your project.