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Description
Oenothera Grandiflora, commonly known as the Ozark Sundrop or Large-flowered Evening Primrose, is a perennial plant that belongs to the Onagraceae family. It is native to North America and can be found in the central and eastern parts of the United States. The plant can grow up to 3 feet tall and spread up to 2 feet wide. It produces yellow, four-petaled flowers that bloom from late spring to early summer. The flowers open in the evening and close in the morning, giving it the name “evening primrose.”
Taxonomic Information
| Domain | Eukaryota |
| Kingdom | Plantae |
| Phylum | Spermatophyta |
| Class | Magnoliopsida |
| Order | Myrtales |
| Family | Onagraceae |
| Genus | Oenothera |
Appearance
Oenothera Grandiflora has lance-shaped, green leaves that are up to 6 inches long. The leaves are arranged in a rosette at the base of the plant and alternate on the stem. The stem is hairy and can be reddish-brown or green in color. The plant produces large, bright yellow flowers that are 3-4 inches in diameter. The petals are crinkled and have a slightly ruffled appearance. The flowers have a sweet fragrance that attracts bees, butterflies, and other pollinators.
Care Guide
Oenothera Grandiflora is a relatively low-maintenance plant that is easy to grow. Here are some tips for caring for your Ozark Sundrop:Water: Water the plant deeply and regularly during the growing season. Allow the soil to dry out slightly before watering again.Fertilization: Fertilize the plant in the spring with a balanced, slow-release fertilizer.Soil: The plant prefers well-draining soil that is rich in organic matter.Sunlight: Oenothera Grandiflora prefers full sun to partial shade.Hardiness Zones: The plant is hardy in zones 5-9.
Common Pests & Diseases
Oenothera Grandiflora is generally resistant to pests and diseases. However, here are some common issues to watch out for:Aphids: Aphids are small, soft-bodied insects that feed on the plant’s sap. They can be controlled with insecticidal soap or by spraying the plant with a strong jet of water.Spider Mites: Spider mites are tiny, spider-like insects that feed on the plant’s leaves. They can be controlled with insecticidal soap or by spraying the plant with a strong jet of water.
Habitat
Oenothera Grandiflora is native to North America and can be found in the central and eastern parts of the United States. It grows in a variety of habitats, including prairies, meadows, open woods, and along roadsides. The plant prefers well-draining soil and full sun to partial shade.
Question and Answer
Q: Can Oenothera Grandiflora be grown in containers?
A: Yes, the plant can be grown in containers as long as they are large enough to accommodate the plant’s size and root system.Q: How often should I fertilize my Oenothera Grandiflora?
A: Fertilize the plant in the spring with a balanced, slow-release fertilizer.Q: Are there any special pruning requirements for Oenothera Grandiflora?
A: No, the plant does not require any special pruning. However, you can deadhead the spent flowers to encourage more blooms.Q: How do I propagate Oenothera Grandiflora?
A: The plant can be propagated by division in the spring or fall.
Related Plants
Here are some related plants to Oenothera Grandiflora:- Oenothera speciosa (Pink Evening Primrose)- Oenothera fruticosa (Narrow-leaf Evening Primrose)- Oenothera macrocarpa (Missouri Evening Primrose)
References
– “Oenothera grandiflora,” Missouri Botanical Garden, accessed September 8, 2021, https://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?kempercode=b632.- “Oenothera grandiflora,” Plant Database, accessed September 8, 2021, https://www.wildflower.org/plants/result.php?id_plant=OEGR.
