Pine straw is a pine needle that has fallen from a pine tree. Pine needles make an excellent ground cover for use in flower beds. Pine straw also helps to insulate the soil from temperature fluctuations. Pine straw is great on slopes and hills because the needles interlock after spreading and keep the pine straw from moving. Sold by the bale.
Slash pine straw is a shorter pine needle. It is about 9 inches in length and used for gardens and small flower beds.