Which Sub-Irrigation System Is Best for Your Plantscape Project?

Sub-irrigation has become an increasingly popular solution for commercial indoor plants because it helps conserve water, reduce maintenance, and promote healthier plants. With several sub-irrigation systems available, choosing the right one depends on your project’s specific needs. In this article, we’ll explore the benefits, different methods and products available, and the factors to consider when selecting the right system.

Benefits of a Sub-Irrigation System

Sub-irrigation systems deliver water directly to a plant’s root system, where it is needed most. As water moves through the growing medium, it is gradually absorbed, providing more even moisture than traditional top watering. The result is healthier plants with less stress.

Sub-irrigation also helps conserve water. Because the growing medium retains moisture, less water is lost to evaporation, resulting in significant water savings. Additionally, sub-irrigation systems reduce watering frequency, allowing plants to go 14 days or more between waterings while lowering labor costs.

Types of Sub-Irrigation

There are a variety of sub-irrigation methods and products available, each with its own benefits and drawbacks. Let’s take a closer look at each one below.

Self-Watering Capillary Mats

Self-watering capillary mats are a popular sub-irrigation solution for commercial indoor plants. They are easy to use and provide consistent moisture to the growing medium, helping reduce the risk of overwatering and underwatering. Available in 30-foot rolls in 1-inch and 7.5-inch widths, capillary mats can be cut to size for a variety of applications. Their lightweight design also makes them easy to install and ideal for smaller spaces.

Self-watering capillary mat pros:

Cost-effective
Simple installation
Minimal materials required

Self-watering capillary mat cons:

Must cut to size for each application
Not suitable for large plants

A roll of white self-watering capillary mat used for sub-irrigation

Self-Watering Capillary Wicks

Closely related to capillary mats are self-watering capillary wicks. They offer a simple and effective way to achieve sub-irrigation while reducing watering frequency. Although made from the same wool felt material as capillary mats, they function differently. Rather than sitting beneath the grow pot, capillary wicks are inserted through the grow pot’s drainage holes into the root ball. They are often used as part of a reservoir system by elevating the grow pot with cross risers.

Self-watering capillary wick pros:

Fits through grow pot drainage holes
Cost-effective
Quick installation
Minimal materials required

Self-watering capillary wicks cons:

May require cross risers
More difficult to reuse than capillary mats

Capillary mats and wicks are among the easiest and most cost-effective sub-irrigation methods. While they work well for simple installations, more complex projects may benefit from one of the self-watering systems discussed below.

White precut wicks spread out on a wooden surface

Mona Plant Sipper Round Insert

The Mona Plant Sipper Round Insert provides a reliable sub-irrigation solution for commercial plant installations. Designed to accommodate a variety of pot sizes, the round insert distributes water evenly, reducing the need for frequent watering. It can be used indoors or outdoors and is especially beneficial for outdoor potted plants where other water sources are not readily available.

The Mona Plant Sipper Insert consists of:

Mona Plant Sipper reservoir
Capillary leg
Plant Sipper lid
Filler pipe with water level indicator

Once assembled, the Mona Plant Sipper functions as a single unit that installs easily into a decorative planter.

Mona Plant Sipper Insert pros:

Integrated reservoir design
Water level indicator
Easy to install as a single unit

Mona Plant Sipper Insert cons:

Limited to compatible pot sizes
Higher cost than capillary mats and wicks
More time-consuming setup than some other sub-irrigation methods

A Mona Plant Sipper sub-irrigation planter insert

Mona Plant Sipper Linkable Tanks

Mona Plant Sipper Linkable Tanks are an effective sub-irrigation solution for both indoor and outdoor plantscaping projects. Designed for in-ground or large built-in planters, the tanks are available in three sizes to accommodate a variety of applications. Made from recycled and recyclable materials, they are 100% water efficient and can reduce watering frequency by up to six weeks. Using capillary action, the system allows plants to draw water naturally through their roots, promoting healthier, fuller growth.

A diagram showing a series of Mona Plant Sipper Linkable Tanks under the ground surface

Mona Plant Sipper Linkable Tank pros:

Linkable for large applications
Long watering intervals
Available in three sizes
Made from recycled and recyclable material

Mona Plant Sipper Linkable Tank cons:

Only suitable for in-ground or built-in planters
Higher initial cost than capillary mat or wick systems
More labor-intensive setup than other sub-irrigation methods

All-In-One Sub-Irrigation and Decorative Planter

Sub-irrigation systems are increasingly sought after for their convenience and plant health benefits, and many manufacturers now integrate these systems directly into decorative planters. Ecopots and Crescent Garden offer self-watering planter options that combine attractive containers with built-in sub-irrigation. These all-in-one solutions simplify installation while helping maintain consistent soil moisture.

These planters incorporate integrated wicking or reservoir systems that store water below the soil surface and deliver it to the roots as needed. By reducing watering frequency, they help maintain healthier plants while decreasing maintenance demands, making them a practical option for commercial interior and exterior plant installations.

Two round gray pots, one holding a philodendron, on an outdoor concrete surface — Ecopots Amsterdam Round Planter

Crescent Garden Rim Self-Watering Planter

All-in-one self-watering planter pros:

No separate irrigation system to purchase
Available in a variety of sizes and styles

All-in-one self-watering planter cons:

Higher upfront cost than traditional planters or mat and wick systems
Requires periodic maintenance and cleaning
Limited customization compared to separate planter and irrigation components

Browse Self-Watering Planters

Choosing the Right Sub-Irrigation System

Choosing the right sub-irrigation system depends on your project’s specific requirements. Consider the advantages and limitations of each method, along with the plant variety, planter size, installation type, and maintenance needs. Whether you need a simple capillary mat, a versatile wick system, a planter insert, or an all-in-one self-watering planter, selecting the right solution can reduce maintenance demands, conserve water, and promote healthier plants.