Plant Care Giant Cactus

Giant Cactus

4.6 out of 5 (30 experiences)

Giant Cactus has a Survivor plant personality Survivor
Giant Cactus has a Fast grower plant personality Fast grower

Also known as



Carnegiea gigantea

How to care for Giant Cactus


How often to water your Giant Cactus

Water needs for Giant Cactus
0.5 cups
every 12

Giant Cactus needs 0.5 cups of water every 12 when it doesn’t get direct sunlight and is potted in a 5" pot.

Use our water calculator to personalize watering recommendations to your environment or download Greg for more advanced recommendations for all of your plants.

Calculate water needs of Giant Cactus

Water 0.5 cups every

Does your plant get direct sunlight?

Select the pot size


Check the growing potential in your area

A plant's growing potential is determined from its location, the time of year, and current local weather.

Select a city to check sunlight intensity

Finding light for Saguaro in your home

Light needs and placement for plant Giant Cactus: 1ft from a window
1ft or less from
a window

Giant Cactus love being close to bright, sunny windows 😎.

Place it less than 1ft from a south-facing window to maximize the potential for growth.

Giant Cactus does not tolerate low-light 🚫.

Select your region to see how the current weather in your area affects the placement of Giant Cactus in your home 🏡.


How to fertilize Giant Cactus

Nutrient, fertilizer, and repotting needs for Giant Cactus: repot after 2X growth

Most potting soils come with ample nutrients which plants use to produce new growth.

By the time your plant has depleted the nutrients in its soil it’s likely grown enough to need a larger pot anyway.

To replenish this plant's nutrients, repot your Giant Cactus after it doubles in size or once a year—whichever comes first.

Difficulty Level

Giant Cactus is generally easy to care for, though some plant parents report facing challenges with growing it. Check out the reviews down below to read more about their experiences!

Water Needs
Sunlight Needs
Native Region
Growth Pattern
Growing Outdoors
Common Issues

Care Summary for Giant Cactus

Giant Cactus

Giant Cactus

Greg recommends:


0.5 cups every 12 days


< 1ft from a window


Repot after 2x growth

Based on the 4” pot your plant is in, and that it doesn’t get direct sunlight.

What other plant parents say

Giant Cactus has a Survivor plant personality Survivor 23
Giant Cactus has a Fast grower plant personality Fast grower 8
Giant Cactus has a Easy to propagate plant personality Easy to propagate 3
Giant Cactus has a Blooms easily plant personality Blooms easily 1
Deborah avatar
leaf-1 9 Plants
xp 692 XP

This is a sturdy healthy looking cactus. The care is easy. I did use soil specifically for succulents.

Chw avatar
leaf-1 18 Plants
xp 876 XP
globe San Francisco, CA

The spines are very sharp.

Survivor Survivor
Ian avatar
leaf-1 8 Plants
xp 219 XP
globe Bozeman, MT

Must have consistent water habits

Survivor Survivor
Fast grower Fast grower
Mhodgdon avatar
leaf-1 3 Plants
xp 101 XP

easy to care for, needs little water, quite hardy

Survivor Survivor
Chloe avatar
leaf-1 5 Plants
xp 170 XP
globe Luton, England

Sometimes goes wonky. Not sure why. 🤦🏼‍♀️😂

Survivor Survivor
Mccall avatar
leaf-1 34 Plants
xp 1,981 XP
globe Salt Lake City, UT

I love this little guy. Low maintenance. Just wants some sun and sandy soil. And a couple friends in a succulent planter never hurt.

Fast grower Fast grower
Survivor Survivor
Lucyisfit avatar
leaf-1 2 Plants
xp 359 XP
globe Norwich, England

lives for ages

Survivor Survivor
Dagoodnoodle avatar
leaf-1 5 Plants
xp 193 XP
globe Maywood, NJ

I’ve had this little guys for almost 4 years as my
very first plant! He took a while to get to the size he is now but he’s a trooper. He’s the best 🥺💕🌵

Survivor Survivor
Bebe avatar
leaf-1 4 Plants
xp 479 XP
globe Saint-Denis, Île-de-France

Her little red flowers are the cutest and the strongest !

Survivor Survivor
Kelsey avatar
leaf-1 5 Plants
xp 182 XP
globe Alpharetta, GA

Whenever you think you should water it, wait a week and then go to water it but before you do, wait another week and then water it

Survivor Survivor
Fast grower Fast grower
Easy to propagate Easy to propagate
Blooms easily Blooms easily
Yellowfellow avatar
leaf-1 9 Plants
xp 237 XP

This dude is so easy to care for,
I water him once a week and his thriving also I keep him next to the window because he really likes to sun bathe ❤️

Lil.lemon avatar
leaf-1 5 Plants
xp 108 XP

Very easy to look after and look really pretty, just be careful when handling them as it’s easy to get barbed

Survivor Survivor
Easy to propagate Easy to propagate
Clarikatie avatar
leaf-1 30 Plants
xp 601 XP
globe Silver Spring, MD

Super slow growing but hardy cactus. Unfortunately they grow so slowly that if your husband accidentally knocks it to the floor and decapitates it, it will take time to recover but it won’t kick the bucket quickly so that’s good! Easy to deal with and interesting looking and a great conversation piece!

Survivor Survivor

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