Sister Agnes (Nerium oleander ‘Sister Agnes’)

Nerium oleander 'Sister Agnes' is a fast-growing evergreen oleander cultivar with single, pure-white flowers and dark green, narrow leaves. It is commonly grown as a shrub, screen, specimen, or trained small tree.

Give Nerium oleander 'Sister Agnes' full sun, ideally at least 6 hours of direct light daily. It can tolerate some partial shade, but reduced light commonly causes leggier growth and fewer flowers.

Water deeply when the soil begins to dry, especially during the first growing season and periods of extreme heat. Once established, it is drought tolerant, but regular deep watering during active growth supports stronger flowering.

Yes, Nerium oleander 'Sister Agnes' is generally evergreen in warm climates. Cold weather, hard freezes, or severe winter exposure can cause leaf drop and dieback.

Nerium oleander 'Sister Agnes' is best suited to USDA Zones 9A through 11. In colder areas, it may require container growing, winter protection, or overwintering in a frost-free location.

It can tolerate brief light frost but should be protected from hard freezes. Freezing temperatures may damage the foliage and stems, while prolonged or severe cold can kill the aboveground plant.

Yes, 'Sister Agnes' oleander tolerates salt spray and is suitable for many coastal landscapes. Plant it in well-drained soil and protect young plants from unusually cold coastal freezes.

Use well-drained sandy, loamy, or clay soil. The plant tolerates a broad range of soil conditions, but consistently waterlogged soil can cause root problems.

Yes, it can grow in clay soil if drainage is adequate. Amend the planting area only as needed and avoid placing the plant in a low spot where water remains after rain.

In favorable landscapes, Nerium oleander 'Sister Agnes' commonly reaches about 10 to 18 feet tall and 10 to 15 feet wide. Size varies with climate, soil, pruning, and whether it is grown as a shrub or standard.

Yes, it can form a dense, fast-growing screen in warm climates. For a row planting, allow approximately 5 to 7 feet between plants, adjusting the spacing for the desired coverage and mature size.

Established plants usually need only light fertilization, often once in spring when grown in reasonably fertile soil. Avoid excessive nitrogen because it can promote soft leafy growth at the expense of flowering.

Insufficient sunlight, excessive shade, drought stress, hard pruning, or competing basal suckers can reduce flowering. Move or prune for better light, water during prolonged drought, and remove vigorous suckers at the base.

Yellow leaves can result from overwatering, poor drainage, nutrient stress, cold damage, or normal aging of older foliage. Check soil moisture and roots first, because oleander prefers drainage rather than constantly wet soil.

Scale insects and oleander caterpillars are the main reported pests. Oleander caterpillars can defoliate a plant rapidly, so inspect leaves and stems regularly and remove infestations promptly.

Yes, it grows well in a large container with drainage holes and a well-drained potting mix. Container plants dry and freeze more quickly than plants in the ground, so monitor watering and move them to protection before hard frost.

Plant it after the danger of hard frost has passed, preferably during spring in areas with cold winters. In warm, frost-free parts of the United States, fall planting can also work if the plant has time to establish before extreme heat or cold.

Choose a sunny site with well-drained soil, dig a hole about as deep as the root ball and wider than its spread, and set the plant at the same depth it was growing. Water deeply after planting and maintain consistent moisture while roots establish.

Yes, it can be trained to a single trunk or grown as a multi-trunk small tree. Remove competing basal stems gradually and support the selected leader while it develops a strong structure.

Propagate 'Sister Agnes' oleander from stem cuttings, which generally preserve the cultivar's characteristics. Use healthy, nonflowering shoots, keep the cuttings warm and lightly moist, and handle all plant material with protective gloves.

It can produce seed, but seedlings may not reproduce the named cultivar accurately. Cuttings are preferred when you want plants that retain the typical 'Sister Agnes' flower color and growth characteristics.

Prune in late winter or early spring to remove dead, damaged, weak, or crossing growth and to shape the plant. Avoid removing all young flowering stems at once, because severe pruning can reduce the current season's bloom.

Thin and shorten selected branches rather than cutting the entire shrub back uniformly. Remove dead wood and spent flower structures, while retaining enough healthy young growth to support flowering.

Yes, all parts of Nerium oleander 'Sister Agnes' are highly toxic if eaten. Keep it away from children and pets, wear gloves when pruning, and seek immediate expert help if any plant material is ingested.

No, do not burn oleander trimmings because the smoke can contain toxic compounds. Bag or dispose of prunings according to local yard-waste rules, and keep the material away from children and animals.

No, it is unsafe around dogs and cats because every part of the plant is toxic if chewed or swallowed. Place it where pets cannot access fallen leaves, flowers, branches, or seed pods.

Yes, wear gloves and avoid touching your eyes or mouth while handling the plant. Wash your hands and tools afterward, and keep sap and trimmings away from children and pets.

Nerium oleander 'Sister Agnes' produces single, pure-white flowers, often with a pale or creamy throat. The flowers are especially showy in full sun.

In warm, frost-free climates, it can bloom from late spring through fall and may flower nearly year-round. Blooming is usually reduced during winter and after cold damage.

The flowers may have a pleasant fragrance, although fragrance intensity can vary with weather, plant conditions, and individual plants. Full sun and adequate moisture generally support the best flowering display.

Deadheading is not essential, but removing spent flower clusters and developing dry fruit can improve appearance. Prune selectively so you do not remove too much new growth that would produce later flowers.