adventitious root (syn. stem root)
A root that arises from a stem, rather than from the primary root.
GardenWeb Glossary of Botanical Terms
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Adventitious root - A general term used to describe any root that grows in an unusual orientation or location; examples include above ground roots.
adventitious root A root in an unusual place, often where a branch contacts soil or damp material. A plant can not be reproduced from cuttings or layering unless adventitious roots develop.
1. Adventitious roots - such as in palms. These are fibrous and easily moved when small.
2. Tap roots - such as in many eucalypts. These tend to be well-developed on plants grown in light sandy soils, which makes them difficult to move.
acrodromous: with veins curving towards the apex actinodromous venation: a leaf vein pattern with 3 or more primary veins diverging radially from a single point actinomorphic: radially symmetrical on a single plane adventitious roots: ...
Layering a stem down and pegging it to the soil produces adventitious roots.
An aerial root above ground is an example of adventitious roots. Ivy uses these roots for climbing.
Roots coming from bulbs, corms, rhizomes, or tubers are adventitious roots, as are roots developed from aerial stems (stolons and runners) and cuttings from stems or leaves. Rhizophora mangle (red mangrove), Pandanus spp. (screw-pine), and Ficus spp.
LAYERING: a method of propagation in which adventitious roots form before the new plant is severed from the parent plant.
Once these adventitious roots establish in the soil, the runners begin to dry up and shrivel away. For this reason, using strawberry plant runners for propagation makes it especially easy to make more plants.
Tomatoes develop adventitious roots—roots that originate from the buried stem. A bigger and broader root system helps the plant support a heavy load of fruit.
The aim is to crush the stems into the ground and encourage adventitious rooting, this will thicken up your lawn nicely. If I were you I would leave cutting it until it has been rolled and thickened in this way.
 See also: Plant, Adventitious, Adventitious roots, Growing, Gardening
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