Hybrid Tea Rose Rosa Welwyn Garden Glory = 'Harzumber' (PBR) (HT)

Water

Hybrid Tea roses like the Rosa Welwyn Garden Glory should be watered deeply and infrequently to encourage deep root growth. The amount of water required can vary with weather conditions, but a general rule is to provide at least 1 inch of water per week. In hot and dry conditions, this could mean watering with about 0.5 gallons per square foot of soil every week. During the growing season, check the soil moisture level regularly; if the top 2-3 inches of soil are dry, it's time to water again. It's best to water early in the morning to allow foliage to dry out through the day, which helps prevent diseases.

Light

The Rosa Welwyn Garden Glory thrives best in full sun, which means it should receive at least 6 hours of direct sunlight each day. The ideal location would provide morning light, which is less intense and helps leaves dry quickly to reduce the risk of fungal diseases. Avoid placing it in shady areas, as insufficient light can lead to weak growth and fewer blooms.

Temperature

The Rosa Welwyn Garden Glory, like most Hybrid Tea roses, prefers a temperate climate with temperatures ranging between 65°F and 75°F for ideal growth. These roses can generally tolerate temperatures as low as 20°F and as high as 90°F, but extreme temperatures can lead to stress. The plant will enter dormancy below 32°F, and it's crucial to protect the base with mulch in winter to prevent freeze damage to the roots.

Pruning

Pruning the Rosa Welwyn Garden Glory is essential for maintaining the plant's health and encouraging vigorous bloom production. Prune in early spring just as the buds start to swell, removing dead or damaged canes and opening up the center of the plant for better air circulation. Also, cut back about a third of the overall height to stimulate strong new growth. Deadheading, or removing spent flowers, should be done throughout the blooming season to promote continuous flowering.

Cleaning

As needed

Soil

Roses require well-draining soil with a mix of organic matter, such as compost or aged manure, to promote healthy growth. The soil pH for Welwyn Garden Glory should be between 6.0 and 6.5. Incorporate a balanced fertilizer at the beginning of the growing season for optimal results.

Repotting

Roses planted in the ground do not require repotting; however, if a Welwyn Garden Glory rose is grown in a container, it should be repotted every 2 to 3 years to ensure the soil remains fertile and aerated.

Humidity & Misting

Roses like the Welwyn Garden Glory thrive in moderate humidity levels. They do not require high humidity, and too much can lead to fungal diseases. Aim for ambient humidity levels without additional misting or special humidity measures.

Suitable locations

• Indoor

  Grow in a bright spot, prune for shape, water regularly.

• Outdoor

  Full sun, enriched soil, adequate water, protect in winter.

• Hardiness zone

  5-9 USDA

Life cycle

The Rosa 'Harzumber', commonly known as the "Welwyn Garden Glory," begins its life cycle as a seed or more commonly as a grafted plant, where a bud from a mature Welwyn Garden Glory is grafted onto a rootstock. After planting, the bud starts to develop shoots and leaves in its growth stage, during which it requires adequate sunlight, water, and nutrients to establish a strong root system and healthy foliage. As the plant matures into the flowering stage, it produces fragrant, full-petaled blooms typically in late spring to summer, with the possibility of a second blooming period in the fall in some climates. Following pollination, the flowers may develop into rose hips (seed pods), which can be harvested for propagation or left for wildlife. The plant then enters a period of dormancy in the winter, where growth slows down and the plant conserves energy. With proper pruning and care, the Welwyn Garden Glory can continue its life cycle for many years, undergoing annual cycles of growth, flowering, and dormancy.

Propogation

• Propogation time

  Spring-Early Summer

• The Rosa Welwyn Garden Glory, commonly known as 'Harzumber' (HT) for its hybrid tea rose classification, can be propagated most successfully by taking semi-ripe cuttings during late summer or early fall. The process involves selecting a healthy, non-flowering stem from the current year’s growth. Cuttings should be about 6 inches (approximately 15 centimeters) in length, with a couple of leaves left at the top, and the lower end cut just below a node. Dipping the cut end in rooting hormone may enhance root development. The prepared cutting should then be inserted into a pot filled with a mixture of peat and perlite, ensuring good contact with the soil. After planting, the cuttings should be kept in a humid environment, which can be achieved by covering the pot with a plastic bag or placing it in a propagator. Within a few weeks to a couple of months, the cuttings should start to root, at which point they can gradually be acclimatized to less protected conditions.