Sorry. As a newbie I couldn't find a way to append the photo I mentioned in my response to Susan's response (but somehow a picture of apples did appear!). I'm trying this route to post a photo of one of my 5-tepal lilies, with a small green leaf just below it which could be the missing one, as Susan had suggested.
That is a leaf that is growing very close to the flower! It is not uncommon for these lilies to be missing one or more petals. There is no need to worry about it.
These article will help you know if your lily is Asiatic or Oriental, and help you to care for the plant:
https://www.gardeningknowhow.com/ornamental/bulbs/lily/oriental-and-asiatic-lilies.htm
https://www.gardeningknowhow.com/ornamental/bulbs/lily/planting-asiatic-lilies.htm
https://www.gardeningknowhow.com/ornamental/bulbs/lily/oriental-lily-plant-care.htm
They are over growing the spot they are in
Like most bulb type flowers, lilies should be divided and transplanted in the fall. The timing often depends on your growing/ hardiness zone.
Here are a few articles to help with growing your lilies:
https://www.gardeningknowhow.com/ornamental/bulbs/lily/dividing-lily-plants.htm
https://www.gardeningknowhow.com/ornamental/bulbs/lily/lily-transplanting.htm
I live in Canada. Our winters can go to -30C for extended periods. How do I overwinter these lillies here?
Since they are in a container, bring it inside a frost-free garage, shed or basement during the winter. Move it back out after the threat of frost has passed in the spring.
Do not bring inside a warm house as that will prevent flowering next summer.
Or, you can dig them up as if they were in the ground to overwinter. Here is how:
https://www.gardeningknowhow.com/ornamental/bulbs/lily/overwintering-lily-bulbs.htm
Do Lillie’s need to refrigerated to grow
You can, but it seems like you already know what needs to be done in order to keep them alive each year. During dormancy, they will need to be dug up and stored in the refrigerator to satisfy the cold stratification requirements. You will want to chill them for 6 to 8 weeks below 40F and above 34F in order for them to rebloom.
This article will help you with the care of Oriental Lilies:
https://www.gardeningknowhow.com/ornamental/bulbs/lily/oriental-lily-plant-care.htm
I received a bouquet that had a stargazer lilies in it. I was wondering, can you still pollenate them at this point?
No. They will not produce any seeds at this point, as a cut flower, unfortunately.
If you do happen upon a living specimen, this article will help you to:
https://www.gardeningknowhow.com/ornamental/bulbs/lily/oriental-lily-plant-care.htm
They rotted and died away. That is common if they are not handled properly. If they were left in a container outside and it got too cold, or they got too wet, they will rot and basically disappear.
The other lily mix "All Summer Long" (vs. "All Summer") are fall planting bulbs, but I'm not sure if the "All Summer" Lilies can be left in the ground year-round in North Vancouver?
We don't sell any products so you didn't buy those bulbs from us. I'm not sure which lilies you have but I looked up those mix names and if the All Summer Long mix contains species, Oriental, Tiger and Asiatic lilies they should survive just fine in the ground over winter. The All Summer mixes I saw online were the same types of lilies.
The summer blooming lilies that are not hardy are rhizomatous perennials like canna lily and calla lilies. They only survive where winters are warm. Elsewhere, they need to be dug and stored in the fall.