If you are interested in getting Calla Lilies for your garden, and are unable to get some friends or a neighboring garden to get you bulbs, then you may consider growing these White beautiful Lilies from seed. Here’s a complete article that describes how to grow the Lilies from seed (link). Here are some extracts from the article:

Before even thinking about planting the calla lily seeds one needs to sort out the best ones by pregrowing them a little. This is done simply by placing a folded damp paper towel on a plate and then spread out the seeds upon it.
There are a lot of reasons not to plant the seed straight out in the garden among birds and mice, there are a lot of dangers still out there for a little seed so the best thing is to preplant it in a small pot so it can grow strong and healthy in peace.

Read the rest of the article at the original link.