To rejuvenate overgrown shrubs, how close to ground level should they be pruned?

When rejuvenating overgrown shrubs, pruning them to a height of 18 inches above ground level is generally considered appropriate. At this height, it allows the plant to regrow vigorously by encouraging new growth from the base. The process stimulates the development of multiple new shoots, leading to a fuller and healthier shrub in the growing season.

Pruning to 18 inches also helps balance the plant's energy between the roots and the new growth, as well as allowing for adequate sunlight and air circulation, which are vital for healthy regeneration. This height strikes a balance between removing excess, older wood while allowing enough structure for the shrub to thrive as it comes back to life after the pruning.

Pruning closer to the ground, such as 6 inches or 12 inches, might remove too much of the plant's framework, potentially jeopardizing its ability to thrive afterward. Conversely, pruning at heights of 24 inches or more might retain too much old growth, which can hinder the rejuvenation process and result in a shrub that remains sparse and unproductive. Thus, the recommended height of 18 inches ensures the shrub has the best chance of re-establishing itself effectively.