Aglaonema Siam Complete Plant Care Guide

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Are you looking for an affordable plant with crazy vibrant colors and grows quickly? Look no further, the Aglaonema Siam is it.

Aglaonema Siam main care directions.

  1. Water. Water once the top 2 inches of soil is dry. This plant can also be kept in leca or straight up water.
  2. Light. Place in a spot getting bright indirect sunlight but can also manage lower light.
  3. Fertilizer. Fertilize in the growing season which is typically March through October. Pause fertilizer in the winter months.
  4. Humidity. Thrives in high humidity 50%+ range but does not need it, also grows rapidly in regular household humidity.

Here’s what to know so Aglaonema Siam thrives in your home.


Aglaonema Siam is a hardy houseplant that can live in a variety of lighting. You can place this plant in any window direction (south, east, west, or north) and your plant will grow. I actually have my plant growing in a dark north facing window and it’s continually pushing out new leaves, so you can just imagine how fast this thing grows near a south facing window.

The most ideal spot for this plant would be near a south or west facing window. This lighting will make the plant go as fast as possible and get crazy big.

This is also a plant you can place under grow lights like T5 Barrina lights. I use these plant grow lights in my home for most of my plants and I love them.


This is one of those easy plants that is quite forgiving. Meaning you can forget to water this plant and it’ll be just fine.

It’s time to water Aglaonema Siam when the top two inches of soil dry out. Check your plants soil either by using a moisture meter or sticking your index finger in about two inches deep. If the soil is dry, it’s time to give your plant a thorough watering. This plant will need water about once a week in the winter and maybe once every 5 days in the summer months.


You can grow Aglaonema Siam in houseplant potting mix, leca, or straight up water. I actually grow this plant in water and whenever I water the plant, I mix in a little fertilizer.

If you decide to grow this plant in houseplant potting mix, make sure the mix is well-aerated and chunky. This kind of potting mix makes sure the plants roots are getting proper oxygen flow. You can make this kind of potting mix yourself by buying different ingredients and mixing them together or by buying a premade potting mix.

My favorite houseplant soil at big box stores is Fox Farm Ocean Forest houseplant mix. This mix comes premade with a blend of earthworm castings, forest humus, moss, and other high quality ingredients.

If you decide to make a potting mix yourself, an easy recipe is 2 parts coco coir and 1 part perlite. You can make this even chunkier by adding chunky perlite or orchid bark.


Aglaonema Siam live in temperatures between 55°F and 85°F. Never put this plant near a drafty area (window, door, vent) of your house.


The key to growing healthy, beautiful houseplants inside your home is with fertilizer.

Fertilizer is key to promoting healthy growth on your plants. Houseplants in our home can’t replenish the nutrients they need which is why fertilizing is so important. Plus, if you want healthy new foliage and large plants, you need to fertilize.

I use and recommend Dyna-Gro which is a high quality fertilizer great for any houseplant. The NPK ratio is 7-9-5. If you’re familiar with chemistry, then you know what these are, but what they do for plants is incredible. N is for nitrogen, which is responsible for new growth on plants. P is for Phosphorous, which is for root growth and flower development. K is Potassium, which is in charge of the overall health of the plant.

A common rule of thumb is to fertilizer during the active growing season, which is typically March through October. You want to pause fertilizer during the dormant season, which is during the winter months. This allows time for your plants to rest and get a break.


This is a tropical houseplant, therefore the plant thrives in high humidity, but it’s not necessary. I don’t grow my plant in any kind of special humidity and it’s pushing out new leaves all the time.

However, icreasing humidity around your plant isn’t difficult and you’ll likely notice your plants growing healthier and happier when they have that boost of humidity.

Here are my best humidity boosting tips:

  • Place your plant near a humidifier that runs daily
  • Place your plant on a pebble tray full of water
  • Place your plant in a group of other plants which creates a microclimate of humidity
  • You may choose to mist your plant but this doesn’t do a whole lot but some people find it enjoyable
  • Use a hygrometer to figure out the humidity around your plants (pictured below)
Use a hygrometer to check the humidity around your plants.


The best way to propagate this plant is via stem cuttings. With clean sheers, you want to cut at the base of the plant where the nodes are. The nodes are right under where the plant starts branching off one another.

Make a diagonal cut and place this in water or soil. I always prefer propagating in water because it allows me to see if the roots are growing. Then I can transfer the plant to my preferred substrate once the roots are a few inches long.

Aglaonema Siam Common Questions

Is Aglaonema Siam rare?

Aglaonema Siam is not a rare houseplant. In fact, you can find this plant at almost any big box store selling plants.

How much is a Aglaonema Siam?

This is an affordable houseplant that should never cost you more than $20.

Is Aglaonema Siam hard to care for?

Aglaonema Siam is not hard to care for which makes it a great plant for beginners.

How do you care for Aglaonema Siam?

Care for Aglaonema Siam by placing in a spot getting some kind of sunlight, water once the top two inches dry out, and fertilize during the active growing season.

If you prefer bottom watering your plants, you can definitely do this with the Aglaonema Siam. Some people prefer bottom watering because this decreases your chances of getting fungus gnats. Bottom watering is also great for people who tend to overwater their plants.

There’s a long list of Aglaonema varieties and they’re all beautiful. Some of the most common Aglaonema are Chinese Evergreen, Burmese Evergreen, Red Peacock, and Emerald Bay.

This plant likes to be slightly rood bound. When your plant seems to be bulging out of the pot and the plant has no more room for roots to grow, it’s time to repot in a pot 1-2 inches larger than the current pot.

Is Aglaonema Siam a fast grower?

Yes, this plant is definitely a fast grower even when placed in low light conditions.

Aglaonema Siam can grow outside in a shaded area if you live in hardy zones of 11-12. Never place this plant in a spot getting direct, harsh sunlight.

How big do Aglaonema Siam get?

This plant can get up to 4 feet tall when given the best growing conditions.

How do I make my Aglaonema Siam bigger?

There are a few things you can do to encourage growth on your Aglaonema Siam.

  • Regularly fertilize your plant so it gets the nutrients it needs
  • Place your plant in bright indirect sunlight like near a south, west, or east facing window
  • Consistently water when the plants soil is almost dry
  • Give it high humidity and keep it on the warmer side

Is the Aglaonema Siam toxic to pets?

Yes, this plant is toxic to pets.  You can get more information on toxic and pet-friendly plants at ASPCA here.

Prevent pests

Aglaonema Siam is prone to falling to pest pressures just like any other plant. This is why it’s key to use pest preventive and stay on top of things before they get out of control. Bugs move quick and they’re tiny microscopic creatures that are hard for the human eye to see, so you really only see them once it’s become a problem.

Pests are annoying because they damage foliage and suck the life out of the plant. Having pests every now and then is just the way it goes for most houseplant enthusiasts, and that’s why pest preventive is so awesome. It really comes in handy and it’s worth it to use.

To prevent pests, here’s what you can do:

  • Use a natural or synthetic pest killer to prevent pests
  • Check your plants once a week for pest pressures
  • Don’t overwater your plants (overwatering can lead to increase in fungus gnats)
Bonide Systemic Granules are a great way to get rid of unwanted pests.

Common issues

Brown tips: If your Aglaonema Siam has brown tips, this means the plant might be getting too much fertilizer or water. Always make sure you’re diluting fertilizer recipes in half and only watering the plant when the top two inches of soil dry out.

Curly leaves: If your Aglaonema Siam has curly leaves, this is a sign that your plant is thirsty or in need of extra humidity. Make sure the plant is never sitting near a drafty area like a window, door, or vent.

Yellowing leaves: If your Aglaonema Siam has yellowing leaves, this is a sign of many things including overwatering, underwatering, too much fertilizer, or pest pressures.

Key Points To Remember

Aglaonema Siam is a stunning houseplant that is great for people new or experienced with houseplants.

Main care tips to remember:

  • Place in a spot getting bright indirect sunlight (south, east, west facing windows) or under plant grow lights
  • Fertilize during the active growing season which is typically between March through October
  • Water once the top two inches of soil dry out

This plant is really easy and there’s not too much to think about when taking care of this plant. Just enjoy the beauty of it!

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