Bearded Iris Iris 'Tom Johnson' (TB)

Water

The Tall Bearded Iris, commonly known as 'Tom Johnson', prefers to be watered thoroughly and then allowed to dry out slightly between watering sessions. During the growing season, typically spring through fall, water the irises about once a week, providing about 1 to 2 inches of water each time, which equates to approximately 0.5 to 1 gallons per square yard of soil. It is crucial to avoid over-watering as too much moisture can lead to root rot. The frequency of watering should be decreased after the blooming period, and during winter months, watering may only be necessary during particularly dry spells. Always apply water directly to the soil, avoiding wetting the foliage to prevent disease

Light

The Tall Bearded Iris 'Tom Johnson' thrives best in full sunlight conditions. It should be placed in a location where it can receive at least six hours of direct sunlight every day. Partial shade is also tolerated, particularly in the hottest parts of the day or in warmer climates, but too much shade can reduce blooming and cause the plant to become leggy

Temperature

The Tall Bearded Iris 'Tom Johnson' is hardy and can tolerate a range of temperatures but grows best when daytime temperatures are between 55°F and 75°F. It can withstand winter cold down to about -20°F, though in such cold climates it should be provided with some winter mulch to protect the rhizomes. Ideally, ensure that the planting spot does not subject the plant to extreme temperature fluctuations which can be harmful

Pruning

The Tall Bearded Iris 'Tom Johnson' should be pruned by removing spent flowers to encourage additional blooms and to prevent seed formation which can sap energy from the plant. After blooming is finished, usually in late spring or early summer, cut back flower stems to the base. In the fall, trim the foliage back to about 6 inches to neaten the plant and reduce overwintering pests and diseases. Dividing the iris clumps every 3-5 years in late summer is also a recommended practice to rejuvenate and prevent overcrowding

Cleaning

As needed

Soil

Bearded Iris 'Tom Johnson' prefers well-draining soil with a slightly acidic to neutral pH of 6.5 to 7.0. A good mix would include loamy garden soil, compost, and gritty sand to ensure proper drainage. Avoid heavy, wet soils as they can promote root rot in irises.

Repotting

Bearded Iris 'Tom Johnson' does not need frequent repotting; it is typically divided and replanted every 3 to 5 years to prevent overcrowding and to rejuvenate the plant.

Humidity & Misting

Bearded Iris 'Tom Johnson' thrives in outdoor conditions and does not require high humidity. Average outdoor humidity levels are suitable for this plant, as too much humidity can lead to disease issues.

Suitable locations

• Indoor

  Provide bright light, good airflow, and avoid overwatering.

• Outdoor

  Full sun, well-draining soil, and divide every 3-5 years.

• Hardiness zone

  3-9 USDA

Life cycle

Iris 'Tom Johnson', a Tall Bearded (TB) iris, begins its life cycle as a rhizome planted shallowly in well-drained soil, ideally in late summer. The rhizome sprouts roots and foliage, with leaves growing in a fan-like pattern. In the following spring, floral stalks emerge, leading to the blooming of the plant's characteristic large and fragrant purple flowers with striking white beards. After blooming, which typically occurs in late spring to early summer, the plant enters a period of photosynthesis and energy storage to prepare for the next growing season. As winter approaches, the iris enters dormancy, with foliage dying back in response to colder temperatures. The cycle recommences in spring as temperatures warm and the plant breaks dormancy, initiating a new round of growth and flowering.

Propogation

• Propogation time

  Late Summer

• The Iris 'Tom Johnson', a Tall Bearded (TB) iris, is commonly propagated through division, a process that can be executed during late summer to early fall, after the plant has bloomed and begun to go dormant. To propagate by division, the clumps of the iris are carefully dug up and the rhizomes are separated with a clean and sharp knife, making sure that each section has at least one fan of leaves and a portion of the roots attached. Trimming the leaves to a length of about one third of their full size, around 4 to 6 inches (10 to 15 cm), will help reduce moisture loss and give the plant a better chance to establish. The new divisions should then be replanted in well-draining soil such that the top of the rhizome is slightly exposed to the sun and gently watered in. This method leverages the iris's natural growth pattern and is effective in maintaining the genetic integrity of the 'Tom Johnson' variety.