Peas are another of my favorite plants for growing in containers. Simply place a branching twiggy stick into the center of the bucket, making sure it is firmly anchored into the growing medium. Then sow pea seeds around the base.
You can plant a single bush bean plant in each bucket. Or, if your bucket rests beneath a trellis or other support, you could consider growing 2-3 climbing/ vining beans in each one. Beans also need plenty of water, so make sure you keep the soil moist, especially when the plants are in flower and when the bean pods start to form.
Strawberries are a relatively easy crop to grow and you can grow a lot in a single gallon bucket. Strawberries need to be watered well, but the medium should be relatively free-draining. A potassium-rich feed when the plants are in flower should help increase yield.
#14 Blueberries & Other Fruit Bushes
Blueberries are another soft fruit that works well in gallon buckets. Many people grow blueberries in pots because they need ericaceous (acid) soil conditions. Growing in a bucket in a suitable growing medium (with a pH of around 5.5) is, therefore, easier than amending a larger area of soil in a garden.
#15 Raspberries & Other Fruit Canes
You can plant one raspberry cane (or other soft fruit cane) per bucket. Make sure that each one has a sturdy stake at the center to provide support. Then tie your canes onto this support as they emerge. Almost any raspberry can be grown in a bucket in this way.