Ceramic and Terracotta Planters on a Balcony: Drying, Frost, Weight
Glazed ceramic and unglazed terracotta planters for a balcony: how fast they dry, why they crack in frost, how heavy they get, and which saucer to use.
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Ceramic and terracotta planters suit a balcony if you can water often and bring them in for winter. Unglazed terracotta is porous, so the mix dries faster than in plastic, and both can absorb water and crack in freeze-thaw cycles. They are heavy before you add wet mix, so check what your balcony can carry first.
If clay turns out too heavy or too thirsty for your balcony, lightweight planters and self-watering planters are the usual alternatives. What goes under a clay pot is covered in planter saucers and drainage, and the balcony planters hub compares every material.
Glazed ceramic, terracotta and plastic side by side
| Feature | Unglazed terracotta | Glazed ceramic | Plastic or resin |
|---|---|---|---|
| Drying | Soaks up water and dries fastest (Illinois, UMD) | Ceramic is a porous material (UMD); the glaze covers part of it | Retains moisture longer (UMD) |
| Winter | Most likely to absorb water and crack (UMD) | Can still crack; protect it in winter (UMD, Illinois) | Check the maker’s cold-weather notes |
| Weight empty | Heavy | Heavy | Light |
| Suits | Plants that like the mix to dry between waterings | A pot that stays put and looks finished | A balcony where weight or daily watering is a problem |
University of Maryland Extension groups clay, ceramic, concrete and wood as porous materials that dry out more quickly than plastic, resin, fiberglass or metal. It also notes a benefit: unglazed terracotta wicks moisture, which helps stop the center of the pot staying wet too long. That suits plants that like the mix to dry a little between waterings. For herbs, see herbs in pots.
Why terracotta dries out so fast on a balcony
A balcony adds sun, wind and reflected heat to the porous wall. University of Illinois Extension says porous material loses water faster than non-porous material, and that a pot can be lined with plastic to resist water loss. A plastic nursery pot set inside the ceramic one does the same job and lifts out for watering.
Illinois calls this double potting. It says to check that the inner pot never stands in water, and to lift it out and drain the outer pot if water collects. Color matters too. University of Maryland Extension warns that dark containers can raise the temperature of the potting mix and injure tender roots, so a dark glaze in full sun works against you.
Self-watering planters for plants that dry out fast
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Do terracotta pots crack in winter?
Terracotta pots can crack in winter. University of Illinois Extension explains that water in the pores of pottery expands when it freezes and cracks the pot. University of Maryland Extension says ceramic containers, especially unglazed terracotta, may absorb moisture in winter and crack from freeze-thaw cycles.
Winter care for clay and ceramic pots
- Empty them. A Colorado Master Gardener answer on Ask Extension says terracotta absorbs water and is best emptied and stored where it cannot take up more.
- Dry, then cover. Illinois says to dry pottery out thoroughly and wrap it securely in plastic to keep it dry.
- Turn it over. If it stays outside, Illinois says to turn it upside down so it does not fill with snow and leaves.
- Lift it. The Ask Extension answer adds that raising containers off the ground helps them survive winter.
On a small balcony, a closet or storage unit indoors is often the only dry space, which is one more reason to keep clay pots to a size you can carry. For keeping the plants themselves alive through a balcony winter, see overwintering container plants.
How heavy is a ceramic planter on a balcony?
A ceramic or terracotta pot is heavy before you fill it, and the wet mix adds far more. University of Maryland Extension says a 20-inch container filled with moist potting mix and plants can weigh 100 pounds. A large glazed pot of that size starts heavier than a plastic one.
Before you buy several large ceramic pots, read balcony weight limits, which explains who can say what your balcony carries. UMD suggests plant caddies, low wheeled platforms, to make heavy containers easier to move.
If weight rules clay out, resin and fiberglass pots are made in terracotta colors and finishes.
Lighter alternatives to ceramic and terracotta
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Saucers and drainage for clay pots
Every ceramic planter needs a drainage hole. University of Illinois Extension says a hole in the bottom is critical so roots get air, and that a pot without one needs a hole made, for example by drilling. Some decorative glazed pots have no hole, so check before you buy.
Skip the gravel layer. University of Maryland Extension says rocks or pot shards in the bottom do not improve drainage and can leave the mix waterlogged. It says drained water can stain concrete and wood decking, so set clay pots on a detachable saucer, which is easier to empty than one fused to the pot. Our guide to planter saucers and drainage covers sizing and pot feet.
Frequently asked questions
Do terracotta pots dry out faster than plastic?
Yes. University of Illinois Extension says clay and terra cotta soak up water and that porous materials lose water faster than non-porous ones. University of Maryland Extension says plastic and metal containers retain moisture longer than unglazed terracotta.
Can terracotta pots stay outside in winter?
Unglazed terracotta is the most likely to crack. University of Maryland Extension says ceramic containers, especially unglazed terracotta, may absorb moisture in winter and crack from freeze-thaw cycles. A Colorado Master Gardener answer on Ask Extension advises emptying terracotta pots and storing them where they will not absorb water.
Are glazed ceramic pots frost-proof?
Do not assume so. University of Maryland Extension names ceramic containers in general, with unglazed terracotta as the main risk, and University of Illinois Extension says freezing water in pottery's pores cracks pots, so protect them in winter.
Should I put gravel in the bottom of a ceramic pot?
Not for drainage. University of Maryland Extension says rocks, gravel or pot shards in the bottom do not improve drainage and can leave the mix waterlogged. It makes one exception: adding weight to steady a light container that tips over.
Sources
- Growing Vegetables in Containers and Salad TablesUniversity of Maryland Extension
- Container Material ChoicesUniversity of Illinois Extension
- Container Drainage OptionsUniversity of Illinois Extension
- Prepping Containers for Winter (Question #922126)Ask Extension (Colorado Master Gardener, Denver County)
Filed under Balcony Planters: Which Container Fits Each Spot.
