Rosemary pruning is an important step in keeping the plant healthy and beautifully shaped. The following are routine rosemary pruning methods:

1. Spring Pruning: Rosemary usually undergoes major pruning in the spring. Waiting for the last of the cold to pass, pruning can be done on the new shoots that have grown. Pruning at this time of year can help shape the overall shape of the plant and stimulate new growth.

2. Regular pruning: In addition to major pruning in the spring, regular light pruning is needed to maintain the shape and health of the plant. You can prune every month or bi-monthly.

3. Cut-off pruning: when rosemary grows too tall or overgrown, cut-off pruning can be used to shorten the entire plant to the desired height. Perform this method of pruning in the spring or early fall.

4. Thinning pruning: look inside the plant and cut off any cross-growth, diseased foliage or weak branches. This will improve overall ventilation and light penetration.

5. Head pruning: cut off flower spikes when the flowers have faded or are about to fade. This will stimulate new growth and encourage more flower buds to form on rosemary.

6. Localized pruning: If an area of rosemary is unhealthy, affected by pests or disease, it can be pruned locally. Prune away the infected or pest-infested part to prevent the problem from spreading to other areas.

7. Use clean pruning tools: make sure your pruning tools are clean, sharp, and wiped down with a disinfectant solution before performing rosemary pruning. This helps prevent the spread of the disease.

Before doing rosemary pruning, it's a good idea to refer to the pruning needs and growth habits of specific varieties. Some rosemary varieties may require more frequent or specialized pruning. In addition, the intensity and timing of pruning can be adjusted depending on growth conditions. If you are not quite sure about rosemary pruning, consult your local horticulturist or plant expert for more detailed advice and guidance.