Answer: Lavender is more difficult to germinate from seed than many other herbs. Germination rates range from poor to uneven, over a period of a month or two. Seeds are usually sown outdoors in autumn, so will need cold stratification to aid germination. Store the seeds in the refrigerator at 41 degrees F. Put them in moist vermiculite or peat moss in a clear plastic bag and store for 1-3 months.
Sow seeds in a tray of soilless mix and keep moist until germination. You might want to put a plastic covering over it to create a "mini-greenhouse." When seedlings are large enough to be handled, repot into individual pots of soilless mix so roots can develop. It may be difficult to achieve plants of much size by your target date, considering the need for cold stratification and the long germination time. Good luck!
Q&A Library Searching Tips