May has a way of sneaking in with heavier rains than many gardens expect. That’s when a hardwood planter box can either stand strong or start collecting more water than it should. When the drainage plan isn’t sorted, things get messy fast. Plants sit in soggy soil, timber begins to soften, and before long, what started as a tidy planting box becomes something harder to manage.

Good drainage makes all the difference. Even the most solid planter won’t last if water has nowhere to go. And since May tends to swing between warm days and sudden downpours, we need solutions that hold up through constant shifts in weather. Let’s look at some simple, solid ways to keep that water moving without harming your box or roots.

Why Drainage Matters for Wooden Planters

Too much water hanging around at the bottom of a wooden planter is never helpful. It weighs down roots, breaks up structure in the soil, and starts to work its way into the timber itself. Over time, that leads to:

• Root systems that rot or stop growing the way they should
• Timber that softens, swells, or begins to discolour at the base
• A box that smells damp all the time or feels heavier than it should

The challenge in May is that weather doesn’t always give you a warning. One week can be dry and warm, then suddenly a weekend of rain floods everything. That’s especially true across most parts of the UK this time of year. So we keep our planter boxes prepped for jumpy conditions, warm sun one minute and a full soak the next.

A hardwood planter box helps, since the timber is naturally strong and holds its shape better than softer wood. But even the best-built box still needs a clear way for water to drain out.

Simple Ways to Improve Drainage Without Cutting Corners

Letting water leave the planter box is the goal. It seems easy, but it’s usually skipped over or not given much thought during setup. That’s when problems start to build. We’ve found a few tweaks that go a long way, especially for spring rain:

• Raise the planter slightly with small feet or low risers, so the base doesn’t sit flat against patio stone or soil
• Layer the bottom inside the box with gravel, broken pot shards, or coarse stone to create fast drainage routes
• Drill spaced drainage holes across the base. Too few or badly placed holes slow the run-off and pool water at one end

Even just lifting a planter by an inch can prevent constant damp at the feet, which helps hold the shape of the box over time. It also keeps your decking or slabs from going green underneath where water might collect.

Laying a stone or gravel base inside the soil keeps roots above any standing water. It also stops your compost or potting mix from compacting into mud.

Line It Right: Choosing Liners That Let Water Move

A liner can help hold the soil in place and protect the wood inside, but it only works when water keeps moving. If too much builds up between the liner and the timber, you’ve got a problem beneath the surface. We stick with materials that support the flow instead of holding it in:

• Breathable liners like fabric weed membrane allow some air to pass while letting water drain away
• Avoid plastic lining unless you’re confident that drainage holes punch clean through. It doesn’t breathe and traps moisture
• Consider using a bit of mesh or coconut fibre at the base of the liner to shape movement and keep soil from clutching at the bottom

Liners that are too thick or non-porous will hold damp in tight corners. Over weeks of wet weather, that’s where you get mould or breakdown. We prefer to treat our boxes in a way that reduces how wet they need to get inside in the first place.

Helping the Timber Last Through Wet Weather

Hardwood helps because it resists wear better than softer woods, particularly where ground contact or standing water is a concern. That said, it still needs basic care to keep in shape during months like May.

• Pick planters made from true hardwoods. These naturally hold up better when moisture levels swing back and forth
• Use an oil or weather seal designed for outdoor wood, and reapply when the finish starts to fade or look dry
• Store boxes away from directly wet spots if you’re not using them, and consider rubber feet to lift them from soggy soil if they sit in grass or earth

We’ve noticed that timber tends to soften where it’s left in one damp position. Rain on its own is fine, but repeated soakings with no air circulation under or around the base is what leads to early weakness. Airflow and lift help more than most realise. Even just moving boxes after a storm can give them a reset before the next one.

JAKK’s hardwood planter boxes are handmade in East Sussex from premium, FSC-certified timber and finished with breathable, weather-resistant oil to protect the wood during spring’s wettest spells. Each one is made to order and can be fitted with drainage holes and internal liners to best match changing local conditions.

Water-Ready Planters That Last All Season

A hardwood planter box gives structure and strength, but the setup underneath and inside is what decides how well it handles British rain. You don’t need a complicated fix to deal with spring weather. Just a few clear holes, a breathable liner, and a raised base can turn a basic box into something that drains well through sudden May downpours.

Planning for wet conditions now saves work later in the season. Well-shaped drainage keeps roots happy and timber dry, even when the sky doesn’t cooperate. And letting water move freely does more to protect plants and planters than any quick patch added after the fact. Starting right means a spring full of steady growth, even if the clouds stick around a bit longer.

Preparing for wetter months or simply want improved drainage for your garden setup? Our handcrafted options are designed to handle changing weather, with every detail, from strong timber to breathable liners, ensuring water keeps moving. When you need a reliable and well-built hardwood planter box that stands up to unpredictable spring rain, we have you covered. At JAKK, we craft each piece with care from our East Sussex workshop. Get in touch to find the best fit for your space.