Introduction
Penstemon ×jonesii Pennell (pro sp.), also known as Jones’ penstemon, is a plant that belongs to the family Plantaginaceae. It is a hybrid species that is believed to have originated from the crossing of P. rostriflorus and P. cyanocaulis.
Origin and Distribution
The plant is native to the United States and can be found in the western states such as Utah, Nevada, and Arizona. Jones’ penstemon usually grows in rocky or gravelly soil at elevations between 4000-8000 feet.
Common Names
Aside from Jones’ penstemon, the plant also goes by other common names such as Jones’ beardtongue, Jones’ blue beardtongue, and Jones’ beardlip.
Appearance
Jones’ penstemon is a herbaceous perennial that grows up to 12-20 inches tall and 18-24 inches wide. It has narrow leaves that are about 0.5 to 1 inch long and 0.1 inch wide. The flowers of the plant are tubular and 1-1.5 inches long. They are usually blue or purple and have a white throat. The blooms appear in late spring and early summer and can last up to two months.
Uses
Jones’ penstemon is commonly used in horticulture and can be planted in rock gardens, borders, or as bedding plants. The plant is also a great addition to xeriscape gardens or any landscape that has a low-water garden design. Jones’ penstemon is a great attractor for hummingbirds and butterflies.
Light Requirements
Penstemon ×jonesii Pennell requires full sun to partial shade, with at least six hours of direct sunlight per day. It can grow in shady areas, but the plant will not produce as many flowers as it would in a sunny location.
Temperature Requirements
The plant is native to the southwest United States and can tolerate a wide range of temperatures. It can withstand hot and dry conditions in the summer and cold temperatures as low as -20°F (-29°C) in the winter. However, during extreme heat or prolonged dry spells in the summer, the plant may require extra watering.
Soil Requirements
Penstemon ×jonesii Pennell prefers well-draining soil that is slightly acidic to neutral (pH 6 to 7). The plant can grow in various types of soil, including sandy, loamy, and rocky soil. It can also tolerate drought conditions but grows better in moist soil. The addition of organic matter, such as compost or leaf mold, can improve the soil's structure and moisture retention.
Cultivation of Penstemon ×jonesii Pennell
Penstemon ×jonesii Pennell prefers to grow in full sun to partial shade. They generally do well in well-drained soils and loamy soil types. It is also essential to ensure adequate air circulation. The ideal pH for cultivating this plant is moderately acidic to neutral.
Watering Needs
Young Penstemon ×jonesii Pennell plants require frequent watering until they establish roots. Once the roots are established, the frequency of watering can be reduced. Water the plant when the upper two inches of soil are dry. It is recommended to use a soaker hose or watering can for irrigation, applying water at the base of the plant.
Fertilization
Penstemon ×jonesii Pennell does not require high levels of fertilization. Use a balanced fertilizer once every four to six weeks, starting in spring and ending in summer. The plant also benefits from organic fertilizers like compost tea, worm compost, and blood meal.
Pruning
Penstemon ×jonesii Pennell is prone to overgrowth, and pruning helps to maintain plant size and shape. Pruning is best done at the end of winter or the beginning of spring. Cut back old stems to encourage new growth. Avoid pruning after the middle of summer as it may affect blooming.
Propagation of Penstemon ×jonesii Pennell
Penstemon ×jonesii Pennell, commonly known as Jones' Beardtongue, is a perennial plant that is native to the western United States. It produces purple or lavender flowers from June to August, and it is an attractive addition to any garden or landscape.
Propagation Methods
Penstemon ×jonesii Pennell can be propagated in several ways, including by seed, stem cuttings, or division.
Seed Propagation
Penstemon ×jonesii Pennell can be propagated by seed, which should be sown in the fall or early spring. The seeds should be lightly covered with soil and kept moist until they germinate. Once the seedlings have developed a few leaves, they can be transplanted to their permanent location.
Stem Cutting Propagation
Penstemon ×jonesii Pennell can also be propagated by stem cuttings. Cuttings should be taken in the early summer, when the plant is actively growing. The cuttings should be taken from the tips of healthy stems, and they should be 3-4 inches long. The leaves on the lower half of the cutting should be removed, and the cutting should be dipped in rooting hormone before being planted in moist, well-draining soil. The cutting should be kept moist until it has developed roots and new growth.
Division Propagation
Penstemon ×jonesii Pennell can also be propagated by division. This is best done in the early spring, before growth begins. The plant should be carefully dug up and divided into sections, making sure that each section has some roots and shoots. The divisions can be replanted in their permanent location and should be kept moist until they become established.
Regardless of the propagation method used, Penstemon ×jonesii Pennell prefers well-draining soil and full sun to partial shade. With proper care, this plant can provide years of beauty and enjoyment.
Disease and Pest Management for Penstemon ×jonesii Pennell
Penstemon ×jonesii Pennell is a hybrid plant that is relatively resistant to diseases and pests. However, certain pathogens and insects can still cause problems. Here are some common diseases and pests that may affect the plant and ways to manage them.
Diseases
1. Root Rot
Root rot is a fungal disease that attacks the roots of the plant, causing wilting, stunted growth, and yellowing of the leaves. To prevent root rot, it is crucial to ensure proper drainage and avoid overwatering.
2. Gray Mold
Gray mold is a fungal disease that appears as a grayish-brown fuzzy growth on the leaves and stems of the plant. To manage gray mold, remove and destroy affected plant parts and consider applying fungicides such as copper sulfate.
Pests
1. Spider Mites
Spider mites are small insects that feed on the plant's sap, causing yellowing and bronzing of the leaves. They are not easy to see with the naked eye, but their (spider) webs on the plant are an indication of their presence. To control spider mites, use insecticidal soap or neem oil.
2. Aphids
Aphids are small insects that suck the sap from the plant, causing distorted and curled leaves. These pests also excrete a sticky substance called honeydew that attracts ants. To manage aphids, use insecticidal soap or neem oil.
Regular monitoring of the plant's growth and health can also help prevent and control diseases and pests. Promptly isolate and remove any diseased or infested plants to prevent the problem from spreading.
