If they don't get full sun, they tend to lean.

I kept mine in the fridge in their box for a week or more, they looked iffy by the time I planted them, but 8 out of 10 came up in a little over a week, was I surprised. I sprayed them with Liquid Fence.

You can stake them. I have many on the south side of my house, and the only ones that are growing absolutely straight get absolutely full sun. I mulched them. Don't forget to stir in a tsp of bone meal with the soil in the bottom of the planting hole like I did my most recent ones. That will give them a good start.

Don't plant them on top of bone meal without mixing it. It can burn the roots.