Hiya @elizabeth7!
Check out this chat we had a while ago:
Substitutions in spellwork and rituals
there are loads of great suggestions: Rosemary, Marjoram, Chamomile, Lemon Balm to name a few - depending on what kind of spell work you needed the lavender for.
For Lilacs I’d go the same way searching for subs - Jasmine looks like a good one!
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