RM Copper Shimmer

RM Copper Shimmer is proof that somebody finally found a productive use for all those pennies hiding under the couch cushions.

This 2026 introduction from Hailey and Mike of River Merle Farm in Olympia, Washington, produces approximately 3-inch blooms in rich, warm copper tones. But “copper” only gets you halfway there. When sunlight hits the flowers, the petals develop a noticeable shimmer, finished with touches of gold at their tips.

Basically, Mother Nature found the metallic crayon box.

The blooms are Miniature Formal Decorative in form, with layers of neatly arranged petals packing an impressive amount of flower into a relatively compact 3-inch package. As the blooms mature and fill out, River Merle says they remind them of large, fully double zinnias.

Plants grow approximately 4.5 feet tall, and River Merle describes them as being packed with blooms throughout the season. That smaller flower size also makes RM Copper Shimmer particularly useful when you want rich autumnal color in a bouquet without one enormous dinner-plate dahlia elbowing everybody else out of the vase.

What really separates this one from the herd, though, is how much the color depends on the light. Indoors, you get those beautiful warm copper tones. Put the bloom in the sunshine and suddenly the shimmer and gold-tipped petals start doing their thing.

It's a flower with a lighting requirement.

Apparently we've reached the stage where the dahlias have riders in their contracts.

At a Glance

Origin: United States
Breeder: Hailey and Mike, River Merle Farm
Introduced: 2026
Bloom Size: Approximately 3 inches
Plant Height: Approximately 4.5 feet
Form: Miniature Formal Decorative
Color: Warm copper with shimmering highlights and gold-tipped petals
Best For: Cutting gardens, bouquets, floral design, and standing in the yard repeatedly turning a flower toward the sun like a confused satellite dish

Moose’s Take

Moose has spent enough years growing dahlias to know that flower colors occasionally require a little imagination.

“Dusty antique apricot blush” sometimes means orange.

“Smoky mauve” occasionally means pink having an identity crisis.

But RM Copper Shimmer actually brought receipts.

The copper is there. The shimmer is there. The little gold tips are there. And when the sunlight catches the flower, suddenly you understand exactly why Hailey and Mike gave it the name.

What really seals the deal for The Gardening Moose is the combination of that unusual coloring with a compact 3-inch bloom. It's not trying to overwhelm you with size. It just keeps producing these densely packed little metallic-looking flowers and waits for the sun to handle the special effects.

No batteries.

No glitter.

No craft-store cleanup.

For once, Moose can enjoy something sparkly without finding it in his fur for the next six months.