By two in the afternoon the big pot of beans by my back door had gone limp. The leaves drooped flat against the soil, edges curling in the heat. I gave it a deep soak, then a second one before dinner, and by evening the whole plant had perked back up and stood tall again.
Yes, you can grow runner beans in pots, and they do well as long as you keep the water steady and give the vines something tall to climb. A pot that dries out at noon is the main thing that holds them back. Container runner beans ask for more attention than ones in the ground, but they reward you with the same bright red flowers and long pods.
The trick is picking a pot big enough to hold moisture and steady a support. A standard runner bean still wants to climb 8 to 15 feet (2.4 to 4.6 m) unless you grow a dwarf type. That much vine needs a wide, deep root run and a frame that won't tip over in a summer storm.
Aim for a container that holds at least 5 gallons (19 liters) per plant, with real drainage holes in the base. A half barrel or a deep 16-inch (40 cm) pot works well and gives the roots room to spread. The more soil you pack in, the longer it stays damp between waterings.
Container Size
- Depth: At least 12 inches (30 cm) deep so roots reach down and the soil holds water through a hot day.
- Width: Plan for one plant per 5 gallons (19 liters) of soil, so two or three vines share a half barrel.
- Drainage: Open holes in the base stop roots from sitting in water, which rots them fast in a closed pot.
Climbing Support
- Height: Set a frame 7 to 8 feet (2.1 to 2.4 m) tall, since the vines keep reaching for more.
- Stability: Push canes deep or tie them to a wall, because a loaded vine catches wind like a sail.
- Shape: A teepee of three or four canes balances the weight better than a single flat trellis in a pot.
Water And Food
- Frequency: Check daily in summer and water twice on the hottest days, since a pot dries far faster than open ground.
- Feeding: Use a light, balanced feed and skip heavy nitrogen, which grows leaves at the cost of pods.
- Mulch: A layer of bark or straw on top slows evaporation and keeps the roots cooler.
Watering is where pots make or break the crop. The ground holds a deep reserve, but a container can swing from damp to bone dry in a single afternoon. Check the top inch each morning, and on a hot day expect to water again before evening. Once the plant sets pods, dry spells make those pods tough and stringy.
Go easy on feeding. Beans pull their own nitrogen from the air, so a heavy feed just pushes leafy growth and fewer flowers. A light, balanced feed every couple of weeks once flowers appear keeps the pods coming. Fresh potting mix usually carries enough to start, so you can hold off until midsummer.
If a tall frame on your patio sounds like too much, grow a dwarf scarlet runner bean instead. The bush cultivar Hestia is the easiest container choice because it stays compact and needs no big trellis (UC ANR). You get the same red and white flowers and full-flavored pods on a plant that tops out near knee height, which suits a balcony or a doorstep pot.
So pick a deep pot with drainage, add a sturdy teepee or grow Hestia, water more often than you would in a bed, and feed with a gentle touch. Do that and a single container by the door can hand you fresh beans all summer long.
Read the full article: Scarlet Runner Bean Growing Guide
