For watering plants there is nothing quite like a keen eye and a steady commitment to caring for them. Steady does not mean around the clock, but that every day or at regular intervals we set aside time to observe the plants’ condition. Yet the reality is that not everyone can stay constant. For people like me, self-watering pots can be very appealing.
It isn’t that they allow us to forget about the plants, but they help take some of the workload and leave us feeling more confident. Once the watering issue is resolved, we can turn our attention to other tasks, such as dusting the leaves or removing spent flowers and dried leaves.
What exactly is a self-watering pot?
When people talk about self-watering pots, many immediately think of a quick fix to go away on holiday without worrying about the plants.
However, their usefulness goes far beyond covering absences. They are systems designed to regulate water supply consistently, adapting to the plant’s actual pace of growth.
These pots help create a more stable environment for the roots, something especially valuable for beginners as well as for experienced gardeners looking to optimise daily care. Understanding how they work is key to getting the best out of them and avoiding common mistakes.
How self-watering pots work
A self-watering pot is a container designed to supply water to the plant gradually, without the need for frequent top-watering from above.
Its main feature is that it includes a small water reservoir separate from the potting medium, but connected to it by different systems that utilise capillary action.
This reservoir tends to be located at the bottom or side of the pot and acts as a reserve. The plant does not receive the water all at once, but gradually, according to its needs. When the soil begins to dry, it draws on the available moisture. If the potting mix is still damp, the water stays in the reservoir.
For example, water can travel up into the potting mix via wicks, cords, tubes or porous materials that connect the soil to the water reservoir. In this way, the soil stays slightly moist for longer, without becoming waterlogged.
In many commercial models, there is also a visible indicator showing how much water remains in the reservoir and when it’s worthwhile to top it up.
Main advantages of self-watering pots
The appeal of this system is no accident. Among its most notable benefits are:
- They provide regular and steady watering, ideal for plants that do not tolerate sudden changes in moisture.
- They reduce the risk of overwatering, one of the most common and damaging mistakes.
- They also help to prevent underwatering, especially in hot periods.
- They allow a more efficient use of water, with less waste.
- They simplify plant care if you are not at home often or tend to forget to water.
These advantages explain why they are increasingly used, both indoors and outdoors.
For what kinds of plants are they suitable?
Although commonly associated with indoor greenery, self-watering pots can be used with a wide variety of species. They work well with green leafy plants, herbs, flowers and even some outdoor specimens.
They can also be used with cacti and succulents, although in these cases it is essential to use a well-draining potting mix and to monitor the system carefully to avoid excess moisture. Self-watering does not replace the need to understand each plant’s particular requirements.
How to choose a suitable self-watering pot
Before opting for this kind of pot, there are a few basics to consider. The first is size, which should not be chosen solely based on the plant’s current appearance but on its medium-term growth.
It’s also important to consider the type of plant and its water demand, since not all plants require the same quantity or frequency.
Lastly, placement matters a great deal: an outdoor pot should have good drainage to prevent problems in wet weather.
How to make a DIY self-watering pot using two pots
A simple way to create a home self-watering system is to use two pots or containers, one slightly smaller than the other. The smaller pot will be where you plant, and the larger one will act as the water reservoir.
In the base of the smaller pot, several holes are made. Through them a cotton string is threaded in a cross shape, with the ends hanging down. Those ends will lie inside the larger pot, which will contain the water.
Once prepared, transplant the plant into the smaller pot with its usual potting mix. The larger pot is filled with water. The string will absorb the water and gradually transfer it to the potting mix.
Another economical way to DIY a self-watering pot
Another, even cheaper option is to reuse a sturdy plastic container. Mark a line a few centimetres from the bottom and make several holes along that line, all at the same height.
Then, add mineral substrate up to cover the holes, insert the plant and fill with more substrate.
By watering via immersion, placing this container into another container with water up to the height of the holes, a small base reservoir is created.
That retained water will be gradually released by capillary action, keeping the moisture without constant watering. There is no need to refill until the reservoir has completely drained.
Practical tips to make sure the self-watering works well
To ensure these DIY systems perform well, it is worth keeping an eye on a few practical details. It is important not to compact the potting mix too much, as capillarity works best with an airy structure.
It is also advisable to occasionally check the condition of the cords or wicks, especially if they are natural cotton.
Observing the plant remains essential. Self-watering is a help, not an infallible system. Adjusting the amount of water, the type of substrate and the exposure will allow this method to become a practical, straightforward and durable ally for plant care.
