In general eucalyptus is available in one form or another most of the year. Periodically a certain type will bloom and is unavailable. Unfortunately they bloom when they choose and that is hard to predict. It is important to keep this in mind if you choose eucalyptus to avoid disappointments if they choose to bloom on your wedding day. On the left is Silver Dollar eucalyptus.
Seeded eucalyptus is very popular and available most of the year.
For a brief period in the spring and fall they are blooming and are not available. In all fairness the seeded euc almost never has this many seed pods though it will have more leaves. Babyblue eucalyptus is very aromatic and is available most of the year with some holes in production in the summer monthes.