In spring when there is rain and cool nights they just need enough water to keep them moist. If you are growing petunias in a pot, aim to have up to 3 plants in a pot that measures 10–12 inches (25–30 cm). Growing Petunias in Pots. Generally, you should not place more than three petunias in a 12-inch pot. For example, plant petunias with red chile peppers, ornamental grasses, and even herbs if you can squeeze them in. Inter-planting and Companion Planting These flowering plants add stunning waves of color to garden design and outdoor home decorating. Fragrant Petunias for Pots. To keep your petunias looking great try to implement these tips during your blooming season. In contrast, plants that have been pinched will weather the summer much better, sustaining all but exceptional wind and storms. Once you have your petunias in the container, then choose the right location for it. In fact, Mexican petunias are invasive, if not monitored they can spread all around the garden.. To grow in pot: Take a medium-sized pot around 11 inches wide. Give Them Plenty of Growing Space. There are a few types of petunias, each with different flowers and growing habits, but all these flowers look spectacular. These are techniques I use in the hot, humid southeastern United States. Petunias planted in pots, window boxes or hanging baskets will need more frequent watering than those planted in landscape beds. How about a hanging basket? Petunias grow in flower beds and containers. The hundred-year-old ‘Balcony’ variety has a similar upright growth habit, which becomes more relaxed and vinelike as the plants age. Space petunia plants about 3 inches (7.6 cm) apart. Check the containers daily to see if the soil is dry. If you’re planting in a container and want to try the Thriller, Filler, Spiller effect , plant small upright petunias around a tall, striking plant or add a trailing one to soften the container’s edge. Containers. Petunias have large blooms and need enough room to develop fully and stay healthy. As the summer progresses (especially in pots) the heat, sun, wind, and pot size all cause the plant to need more water. Contrast the trailing habit of petunias with flowers that grow upright such as snapdragons and stock. 21 Green ideas for beautiful balcony decorating with flowers The roots like to spread in deep so it is always better to have a wide and deep pot. If you are growing petunias in a garden, space them out about 3 inches (7.6 cm) apart. Flowers can also be planted with vegetables! Petunias grow between 6 and 18 inches tall, slightly taller than pansies, and serve as a backdrop. Best of all, petunias are amazingly easy to grow, both in the garden and in containers. Choose a pot that drains well. Grow Veggies in Containers! Companion planting with petunias is often about picking a plant whose shape accents their shape. Wave petunias will grow fast and become root bound within a short time. But it can be worth the challenge to grow petunias from seed, especially if you're trying for a particular variety. Petunias are also some of the fastest growing plants you can buy to beautify your garden. Petunias emit fragrance at dusk to attract the attention of night-flying moths, their preferred pollinators. So if you buy individual plants, make sure to provide them with a pot that has plenty of growing space. How to Grow Petunias From Seed . Start your seeds at least 10 to 12 weeks before your area's projected last frost date. This can result in them becoming leggy and pretty unsightly in a short period of time. During windy, warm days, containers dry out more quickly than garden soil. Petunias make excellent potted plants. Fill in with pansies for a late spring-themed container. Petunias are well suited to container growing. Petunias are bright and lively, bloom from spring until frost, and scent the air with lovely fragrance. See our fun video on planting vegetables in a hanging basket! Petunias are among the most popular flowering annuals for good reason. The container should be big enough to allow your petunias to grow. It's most common to purchase young petunia plants from a nursery.