Is Easter lily oil an aromatherapy or essential oil product?

No. This is a ritual fragrance oil made for anointing, candle dressing, and spellwork tied to the lily's traditional folk-magic correspondences, not a therapeutic or aromatherapy-grade essential oil. I'd treat it the same as any other condition oil on your altar, chosen for scent and correspondence rather than wellness use, and I frame it that way consistently across every ritual oil I stock.

What does Easter lily correspond to in folk magic and Pagan practice?

The white lily carries a long association with purity and rebirth that predates its Easter symbolism, tied to Hera in Greek tradition and Venus in Roman practice, both linked to chastity and renewal. In modern Pagan practice, that correspondence lines up naturally with Ostara and spring rituals marking the turn from winter dormancy into new growth, along with any personal working focused on a fresh start.

Why is this sold as a bulk 16oz bottle instead of a smaller size?

Demand for a seasonal scent like this tends to cluster heavily around a few weeks each spring, so a bulk bottle covers a coven or shop's busiest ritual stretch without needing a mid-season reorder. If you only use Easter lily for a single Ostara ritual each year, a smaller bottle will likely last you multiple seasons and is the more practical starting point.

How do I store this oil so it's still good by next spring?

Keep the bottle capped tightly and stored somewhere cool and dark, away from sunlight and heat, and decant a smaller working amount for regular use so the bulk bottle stays sealed most of the year. Stored that way, a fragrance oil typically holds its scent for around a year, which usually carries a seasonal bottle like this through to the following spring if you haven't used the whole thing.