Here are some key characteristics of Rex Begonias:

1. Foliage: The main attraction of Rex Begonias is their striking foliage. Leaves can come in various shapes, sizes, and colors, including shades of green, pink, purple, silver, and burgundy. The leaves often have intricate patterns, swirls, or spirals.

2. Growing Conditions: Rex Begonias thrive in humid conditions with indirect light. They are typically grown as houseplants. These plants are sensitive to temperature extremes, so they should be protected from harsh sunlight and drafts.

3. Soil: Well-draining soil is essential for Rex Begonias. A mix that includes peat moss, perlite, and pine bark is commonly recommended.

4. Watering: These plants prefer consistently moist soil, but they don't like to be waterlogged. Allow the top inch of the soil to dry out slightly before watering again.

5. Temperature: Rex Begonias prefer temperatures between 60-75°F (15-24°C). They are sensitive to cold drafts and should be protected from temperatures below 50°F (10°C).

6. Propagation: Rex Begonias can be propagated through leaf cuttings or by division. Leaf cuttings should be taken from healthy, mature leaves, and they can be rooted in a suitable potting mix.

Rex Begonias are valued for their ornamental foliage and are a popular choice for indoor gardening enthusiasts who appreciate their unique and colorful appearance.