- Species and varieties: Petunia is a genus of 20 species of flowering plants of South American origin. The most common species used in gardening is Petunia × atkinsiana, which is a hybrid. Yellow petunias are a popular variety known for their vibrant color and are often used in garden beds, containers, and hanging baskets.
- Hybrid or heirloom: Most yellow petunia seeds available in the market are hybrids. Hybrid petunias are bred for specific traits such as color, size, and resistance to diseases. They are known for their vigorous growth and prolific blooming.
- Pruning and training: Regular deadheading (removal of spent flowers) is recommended to encourage continuous blooming. Pinching back the stems can promote bushier growth. Petunias do not require extensive pruning but benefit from occasional trimming to maintain shape and vigor.
- Fertilization needs: Petunias are heavy feeders and benefit from regular fertilization. Use a balanced, water-soluble fertilizer every 2-3 weeks during the growing season. Slow-release fertilizers can also be used at the time of planting. Avoid over-fertilizing, as this can lead to excessive foliage growth at the expense of flowers.
- Hardiness zones: Petunias are typically grown as annuals in USDA hardiness zones 9-11. In cooler climates, they are often grown as annuals and replanted each year.
- Climate requirements: Petunias thrive in full sun and require at least 5-6 hours of direct sunlight per day. They prefer well-drained soil and moderate watering. Petunias can tolerate a range of temperatures but perform best in mild to warm climates.