Large Plants

10 Best Large Cactus Plants to Grow Indoors

Introduction

Large cacti can add a dramatic touch to any indoor space. They are relatively easy to care for, as they require minimal water and bright sunlight. However, it is important to choose the right type of cactus for your home environment and to provide it with the proper care.

Best Large Cacti for Indoor Growing

Here are ten of the best large cactus plants for indoor growing:

1. Blue Myrtle Cactus (Myrtillocactus geometrizans): This fast-growing columnar cactus can reach over 16 feet tall at maturity. It prefers direct sunlight and minimal water.

2. Saguaro Cactus (Carnegiea gigantea): This iconic cactus is one of the defining plants of the Sonoran desert. It can grow up to 40-60 feet tall and prefers direct sunlight and minimal water.

3. Mexican Fence Post Cactus (Pachycereus marginatus): This stunning blue-green columnar cactus can grow up to 20 feet tall. It prefers direct sunlight and minimal water.

4. Golden Barrel Cactus (Echinocactus grusonii): Also known as the mother-in-law’s cushion, this cactus can reach over 3 feet in height and width at maturity. It prefers direct sunlight and minimal water.

5. Candelabra Cactus (Euphorbia ingens): Technically a succulent, this cactus-like plant is one of the most popular indoor varieties. It can grow up to 8-10 feet tall and 15 inches wide indoors. It prefers bright indirect light to direct sunlight and minimal water.

6. Prickly Pear Cactus (Opuntia): These popular indoor cactus varieties can spread from 12 to 18 inches in width. They prefer direct sunlight and minimal water.

7. Organ Pipe Cactus (Stenocereus thurberi): This cactus gets its name from its multi-limbed growth habit, which resembles organ pipes. It can grow up to 16 feet tall and 12 feet wide, but it is very slow-growing. It prefers direct sunlight and minimal water.

8. Mexican Giant Cardon Cactus (Pachycereus pringlei): The tallest cactus in the world, this cactus can grow up to 63 feet tall with a diameter of 39 inches. However, it is also popular as a houseplant due to its unique appearance and ease of care. It prefers direct sunlight and minimal water.

9. Mexican Lime Cactus (Ferocactus pilosus): This barrel cactus is characterized by prominent ribs adorned with bright red spines. It can grow up to 8 feet tall and 12-18 inches wide. It prefers direct sunlight and minimal water.

10. Blue Columnar Cactus (Pilosocereus pachycladus): This blue-skinned cactus can grow up to 33 feet tall outdoors, but it grows much shorter indoors. It prefers bright indirect light to direct sunlight and minimal water.

General Care for Large Cacti

• Light: Most large cacti require at least six hours of direct sunlight per day. Place them in a south-facing window or use artificial grow lights.
• Water: Water your cactus only when the soil is completely dry. Overwatering is one of the most common mistakes cactus owners make.
• Soil: Use a well-draining cactus potting mix.
• Fertilizer: Fertilize your cactus monthly during the growing season (spring and summer).
• Repotting: Repot your cactus every two to three years, or when it becomes rootbound.

Troubleshooting Common Cactus Problems

• Yellowing leaves: This can be a sign of overwatering or underwatering. Check the soil moisture and adjust your watering schedule accordingly.
• Brown spots: Brown spots on the cactus can be a sign of sunburn or disease. Move the cactus to a location with less direct sunlight and treat any diseased areas with a fungicide.
• Drooping stems: Drooping stems can be a sign of overwatering or root rot. Check the soil moisture and repot the cactus if necessary.

With proper care, your large cactus can thrive indoors for many years to come.