Article in English: Cut the lavender at the base of the stem right before the buds open. This will ensure that the dried lavender will retain a strong floral scent and remain it's bright purple color. Aim to get the longest stem possible on the flower. In harvesting lavender you are also pruning the plant, which helps it grow strong throughout the winter. The plant will need the leaves and stem to finish the growing season, so make sure to leave them in place. Once you've harvested a good handful, gather it into a bunch. Cut the bottom off of the bunch so the ends are even. Keep bundles ¾” around or smaller so that they will dry evenly. This will help prevent mold and mildew growth. Wind the rubber bands toward the base of the stems. Keep winding until the stems are tightly secured, but not crushed. Using a rubber band instead of string or ribbon will ensure that the stems won't slip from the tie as they shrink during the drying process. Drying lavender slowly in the dark is the best way to preserve its color, since the sun will fade the purple flowers. Look for a dry, dark place that doesn't get much sunlight, such as your shed, garage, or a shaded place under your eaves. Loop a strand of the rubber band over a hook or nail. You can also tie a string from the rubber band to a hook or rack to hang the lavender, or you can partially unwind a paperclip and use that to hook the rubber band to a rope, chain, or hook. Check every so often to see when the lavender is dry. When you brush the flowers, they should fall easily from the stems. You can leave the flowers on the stems or brush them off to use in sachets or for baking.

Summary in Vietnamese:
Thu hoạch oải hương trước khi hoa nở rộ. Cắt hoa oải hương trưởng thành ngay trên lá. Thu hoạch oải hương thành từng bó. Cột cuống hoa bằng sợi dây cao su. Tìm nơi râm mát để phơi oải hương. Treo bó oải hương chúc xuống. Để oải hương khô trong 2-4 tuần.