SunBlaster Capillary Mat | 2pk - 14.25 x 24.5 inches

Self-Watering Capillary Mat for Seed Trays, 2-Pack

Bottom-watering seed trays by hand often means guessing how much water each cell needs, leaving wet corners next to dry patches in the same tray. This capillary mat wicks water up from underneath the tray instead, spreading moisture evenly across the growing surface so germinating seeds and rooted starts draw water only as needed.

Each mat measures 14.25in x 24.5in and ships two to a pack, and a properly wetted mat can keep a tray self-watering for up to about 7 days, depending on room temperature and humidity.

Key Features & Benefits

• Capillary wicking action — draws water upward from a reservoir or wetted surface beneath the mat instead of watering from above.
• Even moisture distribution — spreads water uniformly across the mat surface so no cell in the tray runs dry ahead of the others.
• Up to about 7 days of self-watering — reduces how often trays need to be checked and refilled, subject to room conditions.
• 14.25in x 24.5in mat size, sold in pairs — fits standard seed-tray footprints and leaves a spare mat on hand for a second tray.

Who Should Use This Capillary Mat

Growers starting seeds or rooting cuttings in trays who want more even, hands-off watering than misting or hand-watering from above provides are the best fit for a capillary mat.

About SunBlaster

SunBlaster designs grow lighting and propagation accessories out of Langley, British Columbia, including capillary mats meant to pair with its seed-tray and light-stand lineup.

Frequently Asked Questions

How does the capillary mat water seed trays?

The mat wicks water upward from a reservoir or saturated surface beneath it, drawing moisture into the tray from below rather than from above. That spreads water evenly across the mat instead of pooling in one spot.

How long can a tray go between refills?

A properly wetted mat can keep a tray self-watering for up to about 7 days, though the exact interval depends on room temperature, humidity, and how many trays draw from the same reservoir. Checking the reservoir during the first cycle is still worth doing until you know how your setup performs.

What size is each mat, and how many come in a pack?

Each mat measures 14.25in x 24.5in, and the pack includes two mats. That leaves a spare on hand for a second tray or a quick swap when one mat needs to dry out before reuse.

Does the mat fit any seed tray?

It's sized to fit standard 1020-style seed-tray footprints, so it works under most trays of that size set directly on top of the mat. For trays outside that footprint, checking the mat's 14.25in x 24.5in dimensions first is the safest approach.

Does the mat need to be replaced?

The mat itself is reusable and can be rinsed out between grows rather than treated as disposable. Replacing it eventually makes sense once wicking performance noticeably declines from mineral buildup or wear.