Rust-Colored Pot Buildup: Salt Deposits or Water Minerals?

Hard, rust-colored crust on pot rims and drainage areas is typically mineral salt buildup from fertilizer and/or tap water.

Source Breakdown

Cleaning Pots

• Remove plant.
• Scrub with diluted Bon Ami (or vinegar soak) and stiff brush.
• Rinse thoroughly.

Prevention

• Use indoor-specific fertilizer at recommended rate.
• Water thoroughly to flush salts—empty saucer.
• Repot annually in fresh mix if buildup recurs.

Yellow/green Miracle-Gro is for outdoor use. Choose a formula labeled for houseplants.