How thick can a cutting be and still root?

The maximum thickness of a cutting that can still root depends on the plant species and the rooting conditions. As a general rule, cuttings should be taken from young, healthy stems that are not too woody. The ideal thickness for most plants is between 1/4 and 1/2 inch (0.6 to 1.3 cm). Cuttings that are too thin may not have enough reserves to support root development, while cuttings that are too thick may be more difficult for the plant to produce roots through.

Some plants, such as roses and grapes, can be successfully propagated from cuttings that are up to 1 inch (2.5 cm) thick. However, these plants typically require special care and attention to ensure that the cuttings root properly.

In addition to the thickness of the cutting, other factors that can affect rooting success include the type of soil or rooting medium used, the moisture content of the medium, the temperature and humidity of the environment, and the availability of light. By providing the right conditions, it is possible to successfully root cuttings from a wide variety of plants, regardless of their thickness.