Seedlings need a few weeks to get established, but then start cutting them back. Even if you want to leave flowers on the plants for the bees, cut most back for bushier, shaplier, plants. Know what you grow. Check out books and references about herbs and their uses. Start with a basic reference that gives scientific names and general information.
Some herbs can be harmful if used incorrectly.
Always check with your doctor before trying herbs for medicinal use. Plant for all seasons, and if you re in a colder area, try hardier herbs such as lavender, rosemary, thyme and sage. Keep a journal. Make a record of new spring plantings and their care. Paste seed packets and instructions into your journal.