The correct spacing of strawberry plants is very important. There are two types of strawberries: june bearers and day neutrals. June bearers are not recommended for container planting because they require a spacing of up to 4 feet. Day neutrals can grow in hanging baskets, barrels and flower boxes.
Day neutral strawberries should be planted in rows no closer than 4 feet. Within a row they should be spaced at 6-inch intervals, according to berry experts at Indiana Berry & Plant Co.
Because day neutrals need to be spaced at least 6 inches apart, each strawberry plant needs a circular area of at least 12 inches, or 1 foot in diameter. However, these spaces will overlap in rows.
About 50 day neutral strawberry plants need no more than 50 square feet of room. This may sound like a lot when the plants are being grown in containers, but consider an average-sized window box that is 3 feet long. One strawberry plant can be planted every six inches, which means five strawberry plants.
Take out your ruler and measure the first three inches as a visual guide to a 3-foot-long window box. One inch equals 1 foot for this purpose. Every 1/2 inch, mentally plant a strawberry plant.