Cut off the stems of lavender along with the flowers, in 6 inch (15 centimeter) segments or longer. The leaves and new stems can be used to infuse oil as well as the flowers, although the woody, thick stems near the base should be avoided. You may use flower buds or strong-smelling flowers. You may wish to pick more lavender than you think you need. Then, if the oil you create isn't strong enough to suit your preferences, you will not have to wait for a new batch of lavender to dry. . If you are using fresh lavender, dry it first in shade or wrapped in a cloth, to enhance its aroma and minimize the chance of the oil becoming rancid. Tie the sprig up with rubber bands or a string and let it hang upside down in a dry, warm area. Exposing it to sunlight will dry the lavender out much faster, but could break down some of its aromatic oils. Fresh cut lavender may take two weeks to dry fully. Some infusers dry it for only one to three days, until it is withered but not crunchy; this reduces the chance of spoilage greatly, but does not eliminate it. Crumble the lavender apart with clean hands, or bruise it slightly with any clean, heavy object to expose its fragrance. If using buds, open them up with a knife or fingers. Place it in a clean jar. Wash your hands and jar first if they are dirty, but dry thoroughly before bringing them into contact with the lavender. Mixing water into the oil may interfere with the infusion. Pour any non-scented or lightly scented oil into the jar, fully covering the lavender but leaving 1–2 inches (1.25–2.5cm) of space at the top to allow for expansion. Almond oil, olive oil, or safflower oil are commonly used for this purpose, although you may wish to smell these first and avoid strong-smelling bottles that could overpower the lavender scent. Cover the jar tightly and leave the mixture to soak in a sunny location. It will most likely take at least 48 hours to achieve a noticeable scent, and more typically the oil is left out for three to six weeks. If you do not have enough sunlight...

TL;DR in Indonesian:
Potong batang lavendel segar atau beli lavendel kering. Biarkan lavendel mengering. Hancurkan lavendel perlahan-lahan dan letakkan dalam wadah. Tuangkan air ke atas bunga. Rendam lavendel jika ada waktu dan sinar matahari. Jika Anda tidak memiliki waktu atau sinar matahari, panaskan minyak perlahan-lahan. Saring minyak. Ulangi proses ini jika Anda ingin membuat minyak yang lebih kuat. Tambahkan beberapa tetes vitamin E (pilihan). Simpan minyak buatan Anda di dalam wadah atau botol gelap.