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How Far Apart Do You Plant Petunias?

Petunias are a self-seeding annual. In other words, they propagate seeds on their own, spreading throughout your garden. Eventually, the spread will slow or stop as available soil nutrients are used. To accommodate a healthy, self-seeding petunia plant, you must leave enough space on each side of the plant.

Size

Petunias will typically cover a 3-foot diameter after they begin to seed. This means you need to leave about 1 foot, 6 inches on each side of the petunia plant.

Considerations

To ensure healthier petunia growth, you should prune dead flowers. So-called "deadheading" will help ensure that the healthy flowers get enough nutrients, even as your petunias are expanding to fill their ideal 3-foot radius.

Setting

To ensure your petunias grow healthily in your garden, you must keep the soil moist to the touch. Petunias also require full sun; even moderate shade can hinder petunia growth.

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About the Author

Richard Kalinowski began writing professionally in 2006. He also works as a website programmer and graphic designer for several clients. Kalinowski holds a Master of Fine Arts from Goddard College and a Bachelor of Science in education from the University of Wisconsin-Whitewater.