When your herb plants grow sturdy stems and begin producing plenty of leaves, you can start harvesting them several times a week. In the height of summer, you may be able to harvest certain plants every day.  Harvest herbs in the morning. In the morning, the flavor of the herbs is strongest. Harvest your herbs just as the dew is drying. Be sure to harvest your herbs regularly, before they have time to produce flowers. When flowers are produced, the plant's energy is directed away from healthy leaf growth. This can change the flavor of the herb in a bad way. To delay this in basil plants, remove the flower buds. You may also use a sharp, clean pair of pruning shears. Be sure your equipment is clean to avoid contaminating the herb plants when you cut them.  Leafy annual herbs, such as basil, can be cut back severely, and they'll grow back within a week or so. Cut the new growth and leave about four to six inches of the stem intact so the plant keeps growing. For perennials, such as thyme and oregano, remove only the leafy tips, or top growth, to keep the plant compact. Herbs are best used soon after they are cut; storing them will cause them to lose flavor. If you need to store fresh herbs for a few days, place the stems upright in a glass of water. Place the glass in the refrigerator and cover it lightly with a plastic bag until use. Harvesting your herbs will provide natural pruning, but in between harvests you still need to prune your herbs to encourage healthy growth patterns. If you don't prune, your herbs will become leggy and tall or produce seeds, which impairs the production and flavor of the leaves.  At the end of the growing season, cut back herbaceous herbs to within a few inches of the ground. They'll return next year.  Cut back evergreens by a third to keep them from becoming woody over the winter. Remove all dead and dying stems, and place mulch around the roots. Pull out dead or dying annuals that won't return the following year.

How would you rephrase that briefly using Vietnamese?
Bắt đầu thu hoạch khi cây phát triển tốt. Dùng dao sạch và sắc để hái rau. Rửa nhẹ nhàng rau và dùng ngay. Tỉa rau thường xuyên.