Growing blueberries 5 gallon bucket size is possible but not a good idea if you want your plant to produce well. These small containers cannot hold enough soil to keep your roots happy and fed. You need at least 15 to 20 gallons (57 to 76 liters) for a blueberry bush to thrive in your space. Anything smaller will stunt your plant and limit your fruit production.
I made this mistake with my first container blueberry plant years ago in my small patio space. The 5 gallon bucket from my hardware store seemed big enough when I started out that spring. My Bluecrop plant looked fine for the first month after I potted it up. Then your growth stops and leaves start drooping no matter how much you water during hot weeks of summer.
The problem with small containers comes down to simple math about your roots and water. Your blueberry roots spread wide near the surface looking for moisture and nutrients. A 5 gallon container gives your roots nowhere to go after just one growing season. Your plant becomes root bound and stressed which shows up as poor growth and few berries on your branches.
Small pots also dry out fast in summer heat when your plant needs water most for fruit. You might need to water twice a day just to keep your soil moist in a small bucket. Miss one watering and your roots cook in that small volume of hot dry soil under the sun. Larger containers hold more moisture and protect your plants against swings in temperature.
The container size blueberries need depends on which variety you choose for your growing space. Full size highbush types like Bluecrop need at least 20 to 25 gallons (76 to 95 liters) to reach their full potential. Compact varieties like Northblue can grow well in your 15 gallon containers if you keep up with watering. Dwarf types like Top Hat work in your containers as small as 10 gallons.
Half whiskey barrels make great homes for your blueberry plants and look nice on your deck or patio. These hold about 25 gallons (95 liters) of soil which gives your roots plenty of room to spread. Fabric grow bags in 20 gallon sizes also work well for you and cost less than barrels. The fabric lets extra water drain away so your roots never sit in soggy soil.
I moved my struggling plant from that 5 gallon bucket to a 20 gallon fabric pot and saw results fast. New growth started within weeks of the move that spring for my bush. The next summer I picked my first real harvest of berries from that same plant. It just needed room to spread its roots and access more water and nutrients for fruit.
My neighbor tried a 5 gallon bucket the same year I did with similar poor results at first for her plant. Her bush dropped most of its leaves by August from the stress of that small pot in the sun. She moved it to a half barrel and it bounced back the next spring with fresh green growth. Now both of us harvest berries every July from plants that almost died in those small buckets.
The right pot size blueberry plants need gives you much better results for only a little more cost upfront. A 20 gallon fabric pot costs you around $15 to $20 at most garden stores today. That small spend saves you years of frustration with stunted plants that produce nothing. Fill your container with acidic potting mix and plant a compact variety for your best results on your patio.
Read the full article: Growing Blueberries: 7 Steps for Success
