Taking Care of a Bonsai Willow Tree

The bonsai willow tree is one of the most popular out there, and with good reason! It has a certain dramatic flair that looks great in any style. Despite its reputation as being difficult to care for due to its rapid growth, we have some time-tested tips to lead you to bonsai success! 

Here’s what you need to know in order to rock a bonsai willow tree: 

  • This a tree that likes direct sunlight. Place it outdoors.
  • Keep the soil moist. These trees need a lot of hydration, but don’t overdo it.
  • You’re going to want to use a quality balanced fertilizer while the tree is in its growth phase.
  • This tree can become very bushy. You’re going to need to do plenty of pruning.
  • A young bonsai willow tree may require up to two yearly repottings. 
  • It’s very likely that you’ll be using wires to keep the branches slanted downwards. 

Growing one of these trees is definitely not a beginner-level challenge. But, with this guide, some patience, and dedication, you’ll achieve stunning results. 

Getting Started 

The Bonsai Willow Tree 

First things first. The bonsai willow tree (or Weeping Willow) is a lovely specimen with a gorgeous shape and catkin flowers that scream “look at me!” as they change their hue from silver to cream over time.

If you want maximum beauty, attractiveness, elegance, and a certain distinction, you can’t go wrong with it. Any knowledgeable grower will also admire your dedication and tenacity if you successfully bonsai one of these trees. And don’t think casual onlookers will resist its charms either! 

Weeping Willow Bonsai
Credits – Pinterest

On to basic care guidelines… 


The bonsai willow tree is primarily an outdoor tree. It needs plenty of sun to live a long, healthy life and reach its maximum potential. Keep it in mind, because you’ll need to place it in a location where it receives plenty of light.

It’s capable of enduring a variety of climates. That means that as long as it’s got sufficient light, it’ll grow strong and endure more than other similar trees. Still, there’s an ideal range of weather types where it can grow to be the healthiest. That’s USDA planting zones 4 to 8.

Can You Grow a Bonsai Willow Tree Indoors? 

Nuh-uh. That’s going to be a definite no-go. This tree requires sunlight and being outdoors. It will tolerate some time indoors, but you should only bring it in if weather conditions get out of hand. Keep it safe, but bring it outside as soon as it’s possible!

On that note, the tree sheds once a year, and needs dormant periods to thrive fully. If you keep the roots well-insulated, then building a shed around the tree may keep it safe from extreme weather. Don’t worry if it sheds its leaves completely and looks dead; if the roots have kept growing, it’ll be back to its old self come springtime!


This tree usually grows near ponds, lakes, or rivers. With that preference for bodies of water, you can probably tell it’s a moisture hog and grows better on well-drained soil. Choose soil with good drainage, so that excess water and fertilizer leaks out and you can tell when it’s ready for re-watering. It should also be slightly alkaline.

Watering your Bonsai Willow Tree

Moisture is the name of the game here. A couple offhand splashes while you’re watching your favorite show on Netflix won’t do; this tree should not be left dry for long periods of time

So, water your tree several times a day. While you should absolutely make sure that there’s no standing water, you should be pouring enough that it’s running over the sides. You’ll notice that this tree drinks heartily, so the soil tends to dry out fast. When you notice that’s starting to happen, it’s time to bring out the H2O again. 

Weeping Willow Bonsai Outdoors
Credits – Bonsai Cuidados

You can get away with positioning your tree in a bright sunlit space and forgetting about it for a while, but not with leaving it without proper hydration. 

Advanced Bonsai Willow Tree Care Guidelines

Fertilizing Tips 

This tree is a big grower, so it doesn’t take too kindly to being over-fertilized. Apply a good solid organic fertilizer six weeks for optimum results. If you use a liquid variety, then do it approximately every two weeks

Avoid fertilizers with high nitrogen. They could lead the tree to develop oversized leaves and large internodes. It also makes it more susceptible to infestations. 

Use fertilizer moderately. Apply it on the soil around the tree, and not directly on the trunk, which could lead to burning.  


You should prune your bonsai willow tree each season. During the winter months, take care to cut off unwanted growths, shoots, or branches that are growing in uncomfortable positions. You can leave a couple of buds so that the next year they’ll replace branches that get too long.

You can also trim the roots if they start to overflow the bonsai pot. That makes room for new eventual growth.

In the summer months, you’ll have to actively trim many more new shoots.


Now, this is a point of contention for some. Purists believe that the bonsai willow tree should be kept in its natural, asymmetrical beauty. They also contend that the tree doesn’t take too well to wiring.

As pragmatic types, we believe that you can wire new shoots by early June so they’re bent down in a hanging position. This is not just for aesthetics, but for practicality. If you do this, make sure the wires don’t bite into the tree’s bark. 

During the spring, you can also wire down older branches as well. You want them to have a downward slant. 


The bonsai willow tree has strong, fast-growing roots. Understandably, they tend to fill out bonsai pots — which tend to be on the small side by design — rather quickly. 

So, you’ll probably need to repot your bonsai willow tree every year. That’s when the buds start to swell. 

Use fresh, well-patted soil when replanting. Make sure to leave no air pockets — you want to avoid these because they can dry out the roots


Bonsai willow trees can fall prey to a variety of insects and pests, the same as any other plant. Willow borer, canker, aphids, caterpillars,  scale, gall makers, gall mites, and rust are pretty common afflictions. 

Use organic pesticides and contact a pro if these problems rear their ugly head. 

Related Questions

Is a Bonsai Willow Tree Poisonous? 

This is a common question. You certainly want to maintain everyone under your roof safe. That includes your family, tenants, and any beloved pets (well, even the ones that annoy you a bit)! 

Most tree varieties used for bonsai are not poisonous. That includes the willow tree, luckily, so you should be more concerned about your cat tearing it to shreds and giving you a heart attack than any damage done the other way around! 

Still, it’s better to be safe than sorry. Some varieties, like the lily, can be harmful to cats; others like the narcissus daffodil can make your dog suffer neurological damage. A few plants, even those used for bonsai can be harmful to humans. Make sure to research every plant you intend to bonsai thoroughly before you have a go at it!

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Sebastian Moncada

I’m also a plant enthusiast and researcher. I’ve been privileged to have lived my whole life around the wilderness of Colombia and I’m happy to share everything I learn along the way. “Adopt the pace of nature. Her secret is patience” – Emerson.

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