ZZ Plant vs Cast Iron Plant
Both thrive in dark corners. The ZZ wants to be forgotten between waterings; the cast iron plant needs a little more moisture but is safe around pets.
Cast Iron Plant is non-toxic to cats and dogs. ZZ Plant is toxic to cats and dogs if chewed, so it needs a shelf pets cannot reach. ZZ Plant wants very low watering (1/5) - water every 2-3 weeks, once the pot is bone dry. Cast Iron Plant needs low watering (2/5): water when the top 3-5 cm of soil has dried out.
What they share: both are rated easy, both want low light and both stay medium.
Choose
ZZ Plant if…
- ✓you forget to water - it prefers to dry out between drinks
- ✓your home runs dry in winter and you will not add a humidifier
- ✓it can go somewhere pets genuinely cannot reach
Choose
Cast Iron Plant if…
- ✓you like a plant that asks for attention on a schedule
- ✓it will live in a bathroom, kitchen or a humidified room
- ✓cats or dogs chew your plants - this one is non-toxic
ZZ Plant vs Cast Iron Plant: side by side
| Attribute |
ZZ Plant
|
Cast Iron Plant
|
|---|---|---|
| Plant type | Foliage | Foliage |
| Difficulty | easy | easy |
| Light | ●○○○○ 1/5 Low light |
●○○○○ 1/5 Low light |
| Water | ●○○○○ 1/5 Very low |
●●○○○ 2/5 Low |
| Humidity | ●○○○○ 1/5 Low |
●●○○○ 2/5 Low |
| Pet safe | Toxic to cats and dogs | Safe |
| Mature size | Medium 30-90 cm (1-3 ft) |
Medium 30-90 cm (1-3 ft) |
| Growth rate | Slow | Slow |
| Air purifying | Yes | Yes |
| Native to | East Africa | Japan |
Key differences between ZZ Plant and Cast Iron Plant
Cast Iron Plant is pet-safe, ZZ Plant is not
Cast Iron Plant is non-toxic to cats and dogs. ZZ Plant is toxic to cats and dogs if chewed, so it needs a shelf pets cannot reach.
Cast Iron Plant drinks more
ZZ Plant wants very low watering (1/5) - water every 2-3 weeks, once the pot is bone dry. Cast Iron Plant needs low watering (2/5): water when the top 3-5 cm of soil has dried out.
Cast Iron Plant needs damper air
Cast Iron Plant rates 2/5 for humidity - ordinary room air is fine. ZZ Plant rates 1/5, so ordinary dry room air is fine.
They come from different habitats
ZZ Plant originates in East Africa; Cast Iron Plant in Japan. Matching the original habitat is the quickest way to guess what each one wants indoors.
How to tell ZZ Plant and Cast Iron Plant apart
Both are dark-corner specialists. The ZZ stores water in potato-like rhizomes and would rather be forgotten entirely; the cast iron plant wants a little more regular moisture. If pets chew leaves, the cast iron plant is the safe one.
Care at a glance
ZZ Plant
Zamioculcas Zamiifolia, Zanzibar Gem
Virtually indestructible with waxy, dark green leaves. Thrives on neglect.
Care in one line: Any light including low, water monthly, very drought tolerant.
Full ZZ Plant care guide →
Cast Iron Plant
Aspidistra Elatior
Nearly indestructible. Thrives in dark corners where nothing else survives.
Care in one line: Low light, infrequent water, tolerates neglect.
Full Cast Iron Plant care guide →ZZ Plant vs Cast Iron Plant: common questions
What is the difference between ZZ Plant and Cast Iron Plant? +
Both are dark-corner specialists. The ZZ stores water in potato-like rhizomes and would rather be forgotten entirely; the cast iron plant wants a little more regular moisture. If pets chew leaves, the cast iron plant is the safe one. On care, cast Iron Plant is non-toxic to cats and dogs. ZZ Plant is toxic to cats and dogs if chewed, so it needs a shelf pets cannot reach.
Which is easier to care for, ZZ Plant or Cast Iron Plant? +
Neither - both are rated easy. The practical difference is cast iron plant is pet-safe, zz plant is not.
Is ZZ Plant or Cast Iron Plant safe for cats and dogs? +
Cast Iron Plant is non-toxic to cats and dogs. ZZ Plant is toxic to cats and dogs if chewed, so keep it out of reach or choose the Cast Iron Plant.
Which needs less light, ZZ Plant or Cast Iron Plant? +
They are the same. Both score 1/5 for light, meaning survives in a dim corner away from any window.
Which needs more water, ZZ Plant or Cast Iron Plant? +
Cast Iron Plant, at 2/5 - water when the top 3-5 cm of soil has dried out. ZZ Plant scores 1/5: water every 2-3 weeks, once the pot is bone dry.
Comparing something else?
Put any two or three of our 116 houseplants head to head on light, water, humidity, size and pet safety.
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