Sundrops Add Sunshine To My Garden: Wildflower Wednesday

– Posted in: Native/Invasive, Roadside Beds, Slope Garden, What's up/blooming

It’s easy to take sundrops for granted, because they’re so easy to grow. Here I was, trying to think of a plant to feature for Wildflower Wednesday. I couldn’t think of a single native plant. Then I saw Beth Stetenfeld’s post on prairie sundrops, and slapped my forehead. Of course! Sundrops are native plants!

When we moved here, sundrops were already growing in the Slope Garden, the only garden bed created by the previous owners.

sundrops in the slope garden

They weren’t merely growing in the Slope Garden, they were taking it over!

Be it daffodils, forsythia, or sundrops–I am a sucker for pure, sunshine yellow. I did want to keep them. Uh–at least some of them. But I wanted to transition the Slope Garden to shrubs and ornamental grasses for easier maintenance, so I needed a new place to grow sundrops.

It may have already occurred to you that sundrops are inclined to spread. Fortunately they are also shallow-rooted.

sundrops showing roots

You can see there isn’t much to the roots, but even a young plant sends out runners. Those shallow roots make them good placeholder plants.

And they are tough. Do you know how tough they are? They are one of the very first passalong plants I received from another gardener. She bent over, yanked three or four from the ground, and just handed them to me. I couldn’t believe it. No digging with a trowel, no trying to keep soil on the roots. She must have seen the shocked look on my face. “Oh, don’t worry. Stick them in the ground when you get home, and they’ll be fine.” And they were.

If that kind of toughness sounds like a weed to you, well . . . some gardeners won’t let sundrops into their garden. But me, I love that sunshine yellow, and I figured out a better place to let them romp. Remember all those daffodils I planted along the road?

daffodils along the road

The roadside daffodils

I dug up the sundrops and interplanted them with the daffodils.
sundrops along the road

This is the same bed as the previous photo, looking from the mailbox corner. The daffodils are going dormant, and the sundrops are at their peak.

The sundrops’ toughness stands them in good stead at the edge of the road. Snow plows pile snow here in the winter. Reflected heat from the road bakes this area in the summer. It doesn’t faze the sundrops one bit. They haven’t choked out all the weeds, but this area is far less weedy than it otherwise would be. To check their spread, once in early spring, and once in late fall, I pull out the plants that have crept beyond their allotted area. In a dry year I might cut down all the flowering stalks and leave the basal rosettes after the daffodil foliage dies down. But so far it’s taken the daffs so long to finally go dormant (into August sometimes!), and the sundrop foliage has remained green, that I haven’t bothered with a trim.

This gives me a swath of yellow in late April/early May with the daffodils, and another swath of yellow with the sundrops in late June/early July. After that, the daylilies in these beds take over. And guess what color they are?

A sundrop by any other name . . . would just be confusing

So far I’ve just referred to these plants by their common name. That’s because I’m not 100% sure of the botanical name. The genus is Oenothera, of that I am sure. I think it’s Oenothera fruticosa, but Beth’s prairie sundrops, Oenothera pilosella, look very similar. What’s the difference between them? According to the New England Wildflower Society, “Oenothera fruticosa: with sepal appendages mostly shorter than 1 mm and erect, capsules clavate to obpyramidal in outline, stipitate, and plants subglabrous to sparsely pubescent with hairs mostly shorter than 1 mm (vs. O. pilosella, with sepal appendages mostly 1–4 mm long and divergent, capsules linear-elliptic or elliptic to narrow-clavate in outline, sessile or short-stipitate, and plants conspicuously pubescent with hairs mostly 1–3 mm long).” I don’t even know what a sepal appendage is. And this plant just might be 3mm hairy.

hairs on sundrop stem

Can you see the hairs on the stem?

But O. fruticosa is supposed to be the narrow-leaved evening primrose (whose flowers open in the day) and the leaves on my plant aren’t narrow as depicted in some (but not all) of the pictures here. William Cullina, in Growing and Propagating Wildflowers of the United States and Canada, says “O. tetragona (Northern Sundrops) is very similar and often confused in the trade. It hails from farther north, ranging up to Nova Scotia and Quebec.” That sounds like my climate, but he doesn’t say how O. tetragona is different. Allan Armitage (Native Plants for North American Gardens) is more helpful. O. fruticosa “subsp. glauca (at one time called Oenothera tetragona and O. youngii) differs by having broader, grayer leaves and smoother stems and leaves than the species.” Broader, definitely; grayer, possibly; smoother?–well, I would have to see the species before I would know if my plants were smoother.

You see? That’s why in this case I stick to the common name. And if by some chance you can’t find a gardener who will give you some, you might look for one of the cultivars mentioned by Armitage: ‘Erica Robin,’ ‘Fyrverkeri’ (‘Fireworks’), ‘Sonnenwende’ (‘Solstice’), ‘Hoheslicht’ (‘Highlight’), ‘Lady Brookeborough,’ or ‘Yellow River.’

I agree with Cullina: “[Sundrops] have a buttercup cheerfulness about them if you have room to accommodate their wandering ways.” Even if you don’t want them in your “civilized” garden, surely there’s a little spot by the mailbox or the side of the garage that could stand a bit of botanical sunshine. Don’t worry, they’re easy to pull up!

sundrops visited by insects

And they support pollinators!

Posted for Wildflower Wednesday, created by Gail of Clay and Limestone, to share wildflowers/native plants no matter where you garden in the blogosphere.

About the Author

Kathy Purdy is a colchicum evangelist, converting unsuspecting gardeners into colchicophiles. She would be delighted to speak to your group about colchicums or other gardening topics. Kathy’s been writing since 4th grade, gardening since high school, and blogging since 2002.

Autumn is a second spring when every leaf is a flower.

~Albert Camus in Albert Camus quotations

Comments on this entry are closed.

Lee@A Guide to Northeastern Gardening July 3, 2018, 5:48 pm

Your sundrops look so cheery and bright all massed out. I was a participant in a. local garden tour this past month and one of the other homeowners had an entire garden bed of these, which I had admired. Now here they are again! Thanks for sharing.

Diana Studer June 30, 2018, 2:42 pm

Evening primrose is an invasive alien here – but they look delightful in your garden.

Jean C June 29, 2018, 7:29 am

I grow Oenothera macrocarpa (Ozark Sundrops) and love their cheerful, sunny yellow that greets me each morning. They’re a very hardy plant but it does spread and is a little difficult to control. But they deadhead themselves, which is a plus.

Jeannie June 29, 2018, 7:27 am

I have a few who were gifted from a friend years ago. They are in the deep shade, under a thick cedar tree between three big rocks, and still, they live. Now that I understand them better, I think I will move some of the seedlings out to the bright sunlight. I have left them in that horrible spot because nothing else would grow there, even weeds. The blooms would be rare, but so bright and welcomed when they finally appeared.

Thanks for sharing.


Beth @ PlantPostings June 28, 2018, 8:17 pm

Thanks for the mention, Kathy! We’re on the same wavelength. I had thought mine were a different species, too, but then they flower all day, which apparently is unique to O. pilosella. Also, the seed capsule narrowing at the bottom is apparently unique, too. In any case, they’re all gorgeous! Wow, you have so many! I just have a tiny patch, but I think I’m going to try to spread the seeds a little more. They’re really very pretty and bright!

Lea's Menagerie June 28, 2018, 5:25 pm


Pat Webster June 28, 2018, 12:07 pm

Good choice to move them by the roadside. If I see some growing anywhere, I’m going to do the same. There’s always room for some yellow cheerfulness.

Gail June 28, 2018, 11:08 am

Kathy, I love them and like you cannot tell them completely apart. I have both O. fruticosa and O. tetragona in the garden and am not aure which has spread the most! Happy WW and this is a lovely post. xo