It sounds like you have a mystery plant that appeared in your planting table! The fact that you don't remember planting it adds to the intrigue. Given its height of about 5 feet and the presence of white buds read more on top, it's difficult to pinpoint the exact plant without more information or a picture.

However, based on the description, there are a few possibilities:

1. A perennial flower or shrub: Some perennial plants can self-seed and grow without direct planting by a gardener. They may appear spontaneously due to seeds carried by the wind or birds.
2. A wildflower: Wildflowers can sometimes pop up unexpectedly in gardens and pots, especially if the area is close to a natural habitat where they naturally grow.
3. A volunteer from a neighboring garden: If you have nearby gardens, seeds may have been carried by animals, wind, or water and found their way into your planting table.