Spider lilies are neither climbers nor shrubs. They are bulbs, meaning they are herbaceous perennial plants that grow from underground bulbs.

Here's why:

* Climbers: Climbers are plants that use tendrils, roots, or other structures to climb upwards, often needing support to grow vertically. Spider lilies have no such structures.

* Shrubs: Shrubs are woody plants that have multiple stems branching from the base. Spider lilies have a single stem from their bulb and are not woody.

So, spider lilies are neither climbers nor shrubs but rather bulbous plants.