IKEA MILSBO Tall Drip Trays: Fit, Watering and Cleaning

TL;DR

Confirm the MILSBO model, fit trays on a properly supported shelf and keep their water level accessible. A tray collects drainage; a removable grid helps keep ordinary pots above it. Keep runoff below the pots and inspect underneath during each watering round.

Check your model

“MILSBO” does not identify every cabinet size. My trays in this guide are for the MILSBO Tall, commonly listed as 73 × 175 cm (28.7 × 68.9 in) externally. ^[1] Those numbers are cabinet dimensions, not the usable shelf surface. They do not establish compatibility with the wider, shorter model.

Check your cabinet's product information, measure the available shelf space and look for clips, cable routes or modifications that affect clearance. If your cabinet has a replacement shelf, measure that too.

My MILSBO Tall drip trays come as individual parts or a full set of two trays and two grids. ^[2] Choose the complete tray-and-grid arrangement when you want pots raised above collected water.

Fit the trays

1. Clear and dry the shelf. Check shelf supports and follow IKEA's assembly and wall-fixing guidance. ^[1]
2. Place the empty trays first. They should sit level without forcing cabinet fittings or trapping cables.
3. Check water containment. Test each tray outside the cabinet with a modest amount of water on a protected surface, then dry its underside and look for unexpected moisture.
4. Fit the grids securely. Check that they are seated before placing plants on top.
5. Test maintenance access. You should be able to remove a pot, inspect beneath the grid and empty a tray without dismantling half the cabinet.

Every centimetre occupied? Leave yourself a hand-sized access route. A shelf that looks impressive but cannot be cleaned is a future weekend project in disguise.

Water without surprises

Where practical, take a draining pot out, water it, allow drainage and return it. If you water inside the cabinet, watch the tray below and stop before its capacity is exceeded. Avoid pouring a full jug onto a crowded shelf while hoping the tray will sort it out.

For conventional draining pots, keep the water below the drainage holes and grid surface. If roots grow through and reach collected water, reassess the arrangement rather than treating it as unchanged ordinary drainage.

Self-watering planters have their own intentional reservoirs. Check those separately. Runoff from another plant or a moss pole can add water where you were not expecting it.

Use the cabinet watering guide for choosing which pots actually need watering during a round.

Humidity and airflow

Water exposed beneath a grid can evaporate. Measure the effect beside the plants rather than assuming a tray delivers a particular humidity percentage. Ventilation, temperature, water surface and cabinet gaps all affect the result.

Start by using trays for drainage management. If you intentionally retain clean water for evaporation, keep it below pot contact and make inspection easy. Increasing the depth is not a reliable way to achieve an exact humidity target.

Space leaves and provide gentle air movement. An internal fan circulates cabinet air; it does not necessarily exchange that air with the room. Persistent leaf wetness and blister-like or corky marks are reasons to review conditions, not to add more tray water. Moisture imbalance can contribute to edema. ^[3]

Cleaning routine

• During watering: inspect the water level, remove fallen leaves and check shelf edges and tray undersides.
• When water becomes dirty or algae builds up: remove plants, lift grids, empty trays and clean both surfaces.
• For routine washing: use lukewarm water, mild soap and a soft brush, then rinse. Follow product-specific care instructions; avoid assuming a printed accessory is dishwasher-safe.
• Before reassembly: dry the shelf and inspect components for cracks, movement or trapped debris.

Keep power connections away from collected water, and use electrical equipment suitable for the intended environment. If fittings require changes, address those before filling trays.

Common myths

• “A humidity tray replaces cabinet maintenance.” You still need access to inspect, empty and clean it.
• “All MILSBO accessories fit both sizes.” Match the exact cabinet and accessory model.
• “More standing water means healthier plants.” Check leaf conditions and pot contact. A humid atmosphere and a saturated root zone are separate issues.

FAQ

Can I use these trays on an upper shelf?

Check shelf support, permitted loading, clearance and access. Count wet pots, substrate, accessories and retained water in the total load; do not assume the tray changes IKEA's shelf limits.

Do I need water in the trays all the time?

No. For straightforward drainage collection, inspect and empty runoff. Retaining water for evaporation is an optional arrangement that needs monitoring.

What if water appears beneath a tray?

Empty and remove it, dry the shelf, then test the tray outside the cabinet. Check overflow, condensation and damage separately before returning it to use.

Ask a question

Tell us your MILSBO model, shelf type and pot arrangement. Are you collecting runoff or deliberately retaining water for evaporation? Include where you find water when something goes wrong.

Sources

1. IKEA: MILSBO 73 × 175 cm assembly, care and safety.
2. Variegata Nordica: MILSBO Tall tray options.
3. University of Wisconsin: Edema and growing conditions.