Growing Strawberries in Pots in Canada
A pot puts strawberries on a balcony, keeps slugs off the fruit and fits a garden with no bed at all. In Canada it also brings two jobs a garden bed does not: daily summer watering and a winter plan.
Growing strawberries in pots works because strawberry roots are shallow: most of them sit in the top 15 to 20 cm, so a container can hold a whole plant. The University of Maryland Extension calls strawberries an ideal fruit for gardeners with limited space and notes they “can even be grown in containers.”
The Canadian catch is temperature at both ends of the year. A pot in July heats up and dries out far faster than a garden bed, and a pot in January has no soil around it to buffer the cold. Get those two right and a few pots will feed you berries from early summer to the first hard frost.
Strawberries in pots, in short: a pot at least 20 cm deep with drainage holes, good potting mix, plants about 20 cm apart, a day-neutral or everbearing variety, 6+ hours of sun, water whenever the top 2 to 3 cm is dry, liquid feed every two weeks, and an unheated, sheltered spot for the winter.
Choosing the Pot
The University of Maryland Extension's container table gives about 20 cm (8 inches) of depth for strawberries. Treat that as the minimum. In a Canadian summer a deeper pot, 25 to 30 cm, holds more water between waterings, and in spring and fall the bigger volume of mix keeps the roots from swinging between hot and cold.
| Container | Plants | Notes |
|---|---|---|
| Pot, 30 to 35 cm across | 2 to 3 | The easiest starting point. Big enough to stay moist through a hot afternoon. |
| Window box or trough, 20 cm deep | 1 per 20 cm | Good on a railing. Dries fast in wind; water daily in summer. |
| Fabric grow bag, 25 to 40 L | 3 to 5 | Drains freely and is light to move into a garage for winter. |
| Strawberry jar with side pockets | 1 per pocket | Attractive, but the top dries out and the bottom pockets stay wet. Water slowly and often. |
| Hanging basket | 2 to 3 | Keeps fruit away from slugs. The smallest volume here, so it dries out the fastest. |
Whatever you choose, it needs drainage holes. Strawberry crowns rot in standing water, and the University of Maryland Extension adds that a layer of gravel in the bottom does not help drainage; it raises the wet zone instead. Fill the whole container with mix.
A fabric bag drains through its sides, so a strawberry crown never sits in a waterlogged pot, and the handles matter more in Canada than anywhere: in late fall you can carry three or four bags into an unheated garage in one trip instead of leaving the roots to freeze on the balcony. Pick a bag at least 25 cm deep.
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Potting Mix and Planting
Use a good bagged potting mix, not garden soil, which packs down in a pot and drains poorly. For fruit in containers the University of Maryland Extension suggests a 50:50 blend of compost and a lightweight soilless potting mix. The RHS uses multi-purpose or soil-based compost.
- Fill the pot to about 3 cm below the rim with moist mix.
- Set the crown at the surface. The crown, where the leaves meet the roots, sits exactly at the level of the mix: buried, it rots; too high, it dries out. This is the same rule as in the garden, and it matters even more in a pot that is watered often.
- Space plants about 20 cm apart, the spacing the RHS uses for containers.
- Water in well and keep the pot out of hot afternoon sun for a few days while the roots settle.
When to plant: potted plants go outside after your average last frost. Dormant bare-root crowns can be potted up earlier and kept in a bright, cool spot until then. The planting table by province works out both dates from Environment and Climate Change Canada frost normals.
Which Strawberries to Grow in Pots
All three types grow in containers. What changes is how the harvest arrives.
Flowers and fruits through most of the season, a few berries at a time. The University of Minnesota Extension describes Seascape and Albion as good in containers. The usual first choice for a pot.
Two crops, early summer and late summer. Quinault stays compact with short runners, which keeps a pot tidy.
One heavy crop over two or three weeks, the summer after planting. Fine in a pot if you want a single big picking.
Alpine strawberries (Fragaria vesca) are a fourth option: small, intensely flavoured berries on tidy plants with few or no runners. They are easy to grow from seed and suit a shady balcony better than the others.
Sun, Water and Feeding
Sun: six hours or more
A south- or west-facing balcony is ideal. On an east-facing one, choose the sunniest corner. In the shade, plants grow leaves and few berries.
Water: check every day in summer
The RHS warns that containers and hanging baskets “can dry out quickly.” Water whenever the top 2 to 3 cm of mix is dry, aim at the mix rather than the leaves, and let excess drain away. Uneven watering, wet then bone dry, is the main cause of small, misshapen berries in pots. A saucer helps in a heatwave but should not hold water for days.
Feed: every two weeks in the growing season
Potting mix holds few nutrients and frequent watering washes them out. The RHS feeds container strawberries fortnightly with a general liquid feed, switching to a high-potassium feed “when the first flower buds form.” A tomato fertilizer is the usual high-potassium choice.
Flowers, Runners and Birds
Pinch off the first flowers for a few weeks after planting so the plant puts its energy into roots. On a June-bearer, the University of Minnesota Extension and most growers remove all first-year flowers; on day-neutrals and everbearers, stop after the first few weeks and let them fruit.
Runners crowd a pot quickly. Cut most of them off, and keep two or three in late summer: pin each young plant onto a small pot of mix beside the parent and cut the runner once it has rooted. Those are next year's plants. The runner and transplanting steps are on our main strawberry guide.
Birds find a balcony pot just as fast as a garden bed. A square of fine netting over three or four short stakes keeps them off without resting on the fruit.
Winter: The Part Canadian Pots Get Wrong
Strawberry plants survive Canadian winters in the ground because the soil around them insulates the crowns. In a pot, the roots are exposed to the air on every side. A useful rule of thumb on this site is that a plant in a pot behaves about two hardiness zones colder than the same plant in the ground. That is a rule of thumb, not a measurement, but it explains why potted strawberries left on a Montreal or Calgary balcony usually die over winter while the same plants in a bed come through.
The University of Maryland Extension advises moving containers to a protected spot and insulating around the sides. In Canada, that means one of three things after the plants have had a few light frosts and stopped growing:
- An unheated garage, shed or cold room that stays near freezing. This is the most reliable option. Water lightly about once a month so the mix never dries out completely.
- Sink the pot in the garden up to its rim and cover the crowns with 10 to 15 cm of straw, as you would a bed.
- Group pots against the house wall and wrap them with burlap and straw. Workable in the mildest zones; risky in zone 5 and colder.
Do not bring them into a warm living room for the winter if you want summer berries; the plants need a cool rest. If you want berries in winter instead, that is a different project with different plants: see growing strawberries indoors in winter. On the BC coast, pots can usually stay outside in a sheltered spot.
Replacing Potted Plants
Container plants wear out faster than a bed. The University of Maryland Extension recommends planting new plants every three years in containers. Replace the mix at the same time; old mix can carry root diseases and has lost its structure. Rooted runners from last summer make free replacements.
Frequently Asked Questions
Can you grow strawberries in a pot in Canada?
Yes. Strawberries are shallow-rooted, so they grow well in pots on a balcony, deck or step. The two things that decide success are steady watering in summer and protecting the roots in winter, because a pot freezes much harder than garden soil.
What size pot do strawberries need?
Use a pot at least 20 cm deep; 25 to 30 cm deep holds water longer and protects the roots better. Allow about 20 cm between plants, so a 30 to 35 cm pot takes two or three plants and a long window box about one plant every 20 cm. Every container needs drainage holes.
Which strawberries grow well in pots?
Day-neutral and everbearing types suit pots because they fruit over a long season instead of in one two-week burst. Albion and Seascape are common day-neutral choices, and Quinault is a compact everbearer. June-bearers also grow in pots but give one short crop.
How often should I water strawberries in pots?
Check the pot every day in summer and water whenever the top 2 to 3 cm of mix is dry. In hot, windy weather that can mean twice a day for small pots. Water at the base rather than over the leaves and fruit.
How do I overwinter strawberries in pots in Canada?
After a few light frosts, move the pots to an unheated garage, shed or cold room that stays just above or around freezing, or sink them in the ground and cover them with straw. Water lightly once a month so the mix does not dry out completely. A warm room is the wrong place, because the plants need a cool rest.
How long do strawberry plants in pots last?
Two to three years. The University of Maryland Extension recommends planting new plants every three years in containers. Root a few runners into small pots in late summer and you will always have young replacements.
Do strawberries in pots need fertilizer?
Yes. Potting mix runs out of nutrients quickly. The RHS feeds container strawberries every two weeks in the growing season, with a general liquid feed at first and a high-potassium feed once the first flower buds form.
Sources
- University of Maryland Extension, Growing strawberries in a home garden, and its container and home fruit garden guides
- Royal Horticultural Society, How to grow strawberries
- University of Minnesota Extension, Growing strawberries in the home garden