Oenothera rhombipetala
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Oenothera rhombipetala Sand Evening Primrose



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Sand Evening Primrose is a stunning biennial that features a host of wonderful Primrose family quirks.  This plant spends its first year as a subtle rosette of leaves – but its second year makes it well worth the wait!  Throughout the extensive bloom period, this plant sets LOADS of butter-yellow blossoms that crowd around the top of stout stems.  The rhombic, or diamond shaped, petals flare out from elongated tubes.  The crinkled leaves twist and curl as they spread away from the 2 foot tall stalks. 

Oenothera rhombipetala grows best in well draining, sandy soils in full or partial sun.  This plant will survive within a greater prairie-type setting, but it thrives with the extra TLC of a dedicated garden site.  Despite its preference for dry sites, Sand Evening Primrose benefits from consistent watering. The extra moisture is not necessary, but it does encourage more prolific flowering throughout the entire bloom period.  To promote re-seeding, leave the area surrounding the plant well cleared; the petite seeds need access to soil and light to germinate.  

Like most members of the Evening Primrose family, the flower petals only open at dusk or on heavily clouded days.  The blooms close and wither with the morning sun.  These night-blooming plants offer a vital food source for niche nocturnal pollinators, such as various species of Sphinx Moth including Hawk Moths, Hummingbird Moths, and Clearwing Moths, as well as Ruby-Throated Hummingbirds on overcast days.  

Oenothera rhombipetala was recently distinguished from its close cousin, Oenothera clelandii - or Cleland’s Evening Primrose; the two can be difficult to tell apart.  A visible distinction is that Sand Evening Primrose has larger flower petals.  Not so obvious is the fact that it requires cross-pollination.  The range for these two species does overlap slightly, especially in Iowa and Illinois, but O. rhombipetala is more often found in the western Great Plains, while O. clelandii is generally found in the eastern portion of the Midwest.

Other scientific names include: Raimannia rhombipetala
Also commonly called Diamond Petal Primrose, Four-Point Evening Primrose, and Rhombic Evening Primrose

Live Plant Shipping Table

Spring Fall Age/Size
Potted 3-PacksN/A September 2.5" wide x 3.5" deep pots

Oenothera rhombipetala - Sand Evening Primrose

Map Key

This map shows the native and introduced (adventive) range of this species. Given appropriate habitat and climate, native plants can be grown outside their range.

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SEED:

Growing your own plants from seed is the most economical way to add natives to your home. Before you get started, one of the most important things to know about the seeds of wild plants is that many have built-in dormancy mechanisms that prevent the seed from germinating. In nature, this prevents a population of plants from germinating all at once, before killing frosts, or in times of drought. To propagate native plants, a gardener must break this dormancy before seed will grow.

Each species is different, so be sure to check the GERMINATION CODE listed on the website, in the catalog, or on your seed packet. Then, follow the GERMINATION INSTRUCTIONS prior to planting. Some species don't need any pre-treatment to germinate, but some species have dormancy mechanisms that must be broken before the seed will germinate. Some dormancy can be broken in a few minutes, but some species take months or even years.

Seed dormancy can be broken artificially by prolonged refrigeration of damp seed in the process of cold/moist STRATIFICATION. A less complicated approach is to let nature handle the stratifying through a dormant seeding, sowing seeds on the surface of a weed-free site in late fall or winter. Tucked safely beneath the snow, seeds will be conditioned by weathering to make germination possible in subsequent growing seasons.

To learn more, read our BLOG: How to Germinate Native Seeds

DORMANT BARE ROOT PLANTS:

We dig plants when they are dormant from our outdoor beds and ship them April-May and October. Some species go dormant in the summer and we can ship them July/August. We are among the few still employing this production method, which is labor intensive but plant-friendly. They arrive to you dormant, with little to no top-growth (bare-root), packed in peat moss. They should be planted as soon as possible. Unlike greenhouse-grown plants, bare-root plants can be planted during cold weather or anytime the soil is not frozen. A root photo is included with each species to illustrate the optimal depth and orientation. Planting instructions/care are also included with each order.

Download: Installing Your Bare-Root Plants

POTTED PLANTS:

3-packs and trays of 32, 38, or 50 plants leave our Midwest greenhouses based on species readiness (being well-rooted for transit) and order date; Spring shipping is typically early May through June, and Fall shipping is mid-August through September. Potted 3-packs and trays of 38 plugs are started from seed in the winter so are typically 3-4 months old when they ship. Trays of 32/50 plugs are usually overwintered so are 1 year old. Plant tray cells are approximately 2” wide x 5” deep in the trays of 38 and 50, and 2.5" wide x 3.5" deep in the 3-packs and trays of 32; ideal for deep-rooted natives. Full-color tags and planting & care instructions are included with each order.

Download: Planting and Care of Potted Plants

*PLEASE NOTE: we are a mail order nursery and have no retail facilities, but you may pick up your order if prior arrangements are made. Pick up orders are subject to **MN Sales Tax.

Shipping & Handling Charges:
SEED $100.00 and under: $5.00
Retail SEED orders over $100.00 ship free! Custom seed mixes or wholesale seed sales over $100, add 5% of the total seed cost
(for orders over $1,000 a package signature may be required)

BARE ROOT and POTTED PLANTS $50.00 and under: $9.00
over $50.00: 18% of the total plant cost. (For orders over $1,000 a package signature may be required.)

TOOLS and BOOKS have the shipping fee included in the cost of the product (within the contiguous US).

**We are required to collect state sales tax in certain states. Your state's eligibility and % will be calculated at checkout. MN State Sales Tax of 7.375% is applied for orders picked up at our MN location. Shipping & handling charges are also subject to the sales tax.

Shipping Season:

SEED, TOOLS and BOOKS are sent year-round. Most orders ship within a day or two upon receipt.

BARE ROOT PLANTS are shipped during optimal transplanting time: Spring (April-May) and Fall (Oct). Some ephemeral species are also available for summer shipping. Since our plants are field-grown, Nature sets the schedule each year as to when our season will begin and end. We fill all orders, on a first-come, first-serve basis, to the best of our ability depending on weather conditions beyond our control.

POTTED PLANTS (Trays of 32/38/50 plugs and 3-packs) typically begin shipping early May and go into June; shipping time is heavily dependent on all the species in your order being well-rooted. If winter-spring greenhouse growing conditions are favorable and all species are well-rooted at once, then we ship by order date (first come, first serve).  We are a Midwest greenhouse, and due to the challenges of getting all the species in the Mix & Match and Pre-Designed Garden Kits transit-ready at the same time, we typically can't ship before early May.  Earlier shipment requests will be considered on a case-by-case basis.

*We are unable to ship PLANTS (bare root or potted) outside the contiguous US or to CALIFORNIA due to regulations.

Delivery:

We ship using USPS, UPS and Spee Dee. UPS and Spee Dee are often used for expediting plant orders; they will not deliver to Post Office Box numbers, so please also include your street address if ordering plants. We send tracking numbers to your email address so please include it when you order.

FOR MORE DETAILED SHIPPING INFORMATION, INCLUDING CANADA SHIPPING RATES (SEED ONLY), PLEASE SEE 'SHIPPING' AT THE FOOTER OF THIS WEBSITE.

iDetails

Seeds/Packet
500
Seeds/Ounce
130,000
Germination Code
D     ?
Life Cycle
Biennial
Sun Exposure
Full, Partial
Soil Moisture
Dry
Height
2 feet
Bloom Time
June, July, August, September
Bloom Color
Yellow
Advantages
Deer Resistant
USDA Zones
4-8
Catalog Number
OEN20F