Johnson's Blue Geranium, also known as Geranium 'Johnson's Blue', is a popular perennial flower that is prized for its vibrant blue-purple flowers and attractive foliage. This plant is a hybrid of Geranium pratense and Geranium himalayense, and it is known for its robust growth and ease of cultivation. In this article, we will provide a comprehensive guide on how to grow Johnson's Blue Geranium, including its ideal growing conditions, care requirements, and propagation methods.
Introduction to Johnson’s Blue Geranium
Johnson’s Blue Geranium is a low-maintenance plant that thrives in a variety of conditions, making it a great choice for gardeners of all skill levels. It produces stunning blue-purple flowers in late spring and early summer, which are borne on tall, slender stems that rise above the foliage. The plant’s leaves are a deep green color and have a delicate, lacy texture that adds to its ornamental value. With proper care, Johnson’s Blue Geranium can grow up to 2-3 feet tall and wide, making it a great choice for borders, containers, and cottage gardens.
Ideal Growing Conditions
To grow Johnson’s Blue Geranium successfully, it’s essential to provide it with the right growing conditions. This plant prefers full sun to partial shade and well-draining soil that is rich in organic matter. It can thrive in a variety of soil types, including clay, loam, and sand, as long as the soil is not waterlogged. Johnson’s Blue Geranium is also relatively drought-tolerant, but it will perform best with regular watering. In terms of temperature, this plant can tolerate a wide range of temperatures, from -20°F to 80°F (-29°C to 27°C), making it a great choice for gardeners in USDA zones 4-8.
| Soil Type | pH Range | Moisture Level |
|---|---|---|
| Clay | 6.0-7.0 | Medium to dry |
| Loam | 6.0-7.0 | Medium |
| Sand | 6.0-7.0 | Dry to medium |
Care Requirements
To keep Johnson’s Blue Geranium looking its best, it’s essential to provide it with the right care. This includes regular watering, fertilization, and pruning. Water the plant deeply once or twice a week, depending on weather conditions, and fertilize it annually with a balanced fertilizer. Prune the plant in late winter or early spring to remove dead or damaged stems and encourage new growth. It’s also a good idea to divide and replant the plant every 3-4 years to maintain its vigor and prevent it from becoming too leggy.
Propagation Methods
Johnson’s Blue Geranium can be propagated through division, cuttings, and seed. Division is the most common method of propagation, as it allows you to produce new plants with the same characteristics as the parent plant. To divide the plant, dig it up in the spring or fall and separate the roots into sections, making sure each section has at least one “eye” or growing point. Replant the sections immediately, water well, and keep the soil moist until the new plants are established. You can also propagate Johnson’s Blue Geranium through cuttings, which should be taken in the spring or summer when the plant is in active growth. Take 3-4 inch stem cuttings, remove the lower leaves, and plant them in a pot filled with a well-draining seed starting mix. Keep the soil moist and warm until the cuttings are rooted, then transplant them into individual pots.
- Division: Divide the plant in the spring or fall, making sure each section has at least one "eye" or growing point.
- Cuttings: Take 3-4 inch stem cuttings in the spring or summer, remove the lower leaves, and plant them in a pot filled with a well-draining seed starting mix.
- Seed: Sow seeds indoors 8-10 weeks before the last frost date, then transplant them outside when the weather is warm.
How often should I water Johnson’s Blue Geranium?
+Water Johnson’s Blue Geranium deeply once or twice a week, depending on weather conditions. Avoid overwatering, as this can lead to root rot and other problems.
Can I grow Johnson’s Blue Geranium in a container?
+Yes, Johnson’s Blue Geranium can be grown in a container. Choose a container that is at least 6-8 inches deep and has good drainage holes. Use a well-draining potting mix and fertilize the plant regularly.
Is Johnson’s Blue Geranium deer-resistant?
+Yes, Johnson’s Blue Geranium is deer-resistant. It is also resistant to rabbits and other small animals, making it a great choice for gardeners who live in areas with high deer activity.
