That's not quite accurate. While scientists do group plants, they typically use a system with more than three large groups. The most common classification system divides plants into two main groups:

1. Non-vascular plants (also called bryophytes): These include mosses, liverworts, and hornworts. They lack a specialized vascular system for transporting water and nutrients, so they are typically small and live in moist environments.

2. Vascular plants: These plants have a vascular system that allows them to grow larger and live in drier environments. They are further divided into two main groups:

* Seedless vascular plants: These include ferns, horsetails, and clubmosses. They reproduce using spores.

* Seed plants: These include gymnosperms (conifers, cycads, ginkgoes) and angiosperms (flowering plants). They reproduce using seeds.

So, while there are three "large groups" (non-vascular plants, seedless vascular plants, and seed plants), it's important to remember that these groups are further subdivided into more specific classifications.