Bees mostly skip pink. Bee eyes run on blue, green, and ultraviolet, so bright pink and red read as hummingbird and butterfly signals instead. You will still find pink flowers bees work over all day, and you can credit the nectar and the landing room for that, not the shade of your petals. Plant pink for the birds and the butterflies. Then set violet, purple, blue, yellow, or white beside your pink so the bees get a color you cannot see and cannot fake.
Last August I spent ten minutes crouched on the gravel path that edges my own border, waiting for a swallowtail to settle. The swallowtail skimmed the tall thin spires twice and never stopped. Then down onto a flat pink cluster near my knee, feet planted, working one floret after another for a solid minute. Butterflies have to land before they feed, so a wide flat face or a tight cluster of small florets holds a swallowtail where your narrow tubes cannot.
Bee color vision works on receptors that mix green, blue, and ultraviolet light. Red falls outside that range. Penn State Extension states that bees cannot see red at all, though yellow and orange come through fine. Pink sits close to red. A petal that looks bright and loud to you gives a bee far less to go on, and that gap explains why your pink border can be busy with butterflies and quiet on the bee side.
Bees
- Color range: Blue, green, and ultraviolet in combination, with red missing from the picture.
- Flowers that pull them in: Violet, purple, blue, yellow, or white blooms, plus petals that carry ultraviolet patterns.
- Hidden marks: Many bee-pollinated flowers dim the ultraviolet near each petal center, a target you cannot see and a bee cannot miss.
Hummingbirds
- Color range: Ultraviolet all the way through red, the widest range of your three main visitors.
- Top picks: Bright red, pink, and orange, which is why a pink drift keeps birds coming back.
- Garden role: Carries the warm end of your bed with no help from the bee colors.
Butterflies
- Color range: Bright colors across red, orange, yellow, pink, and blue-purple.
- Landing needs: Large flat flowers or dense clusters, since a butterfly has to set down before feeding.
- Garden role: Shares your pink and red with the birds, so one planting serves both.
The reverse holds for blue. Bees work blue petals hard and view those flowers in the ultraviolet range, so a block of blue gives your bees something a pink drift cannot. Many bee flowers also carry a patch of low ultraviolet reflectance near the petal center. You will never see that mark. A bee reads the mark from the air like a bullseye and lands dead on target.
None of this shows up on a plant tag. Shopping for pink flowers bees will use means reading the whole plant, not the petal color, so count colors instead of trusting the label. Stand at the edge of your bed in July and look for blue and yellow in bloom at the same time. If pink and red are doing all the work, your bees are eating somewhere else.
Hummingbird flowers run on a wider range. Birds see from ultraviolet through red, and your pink drift sits inside that range. The colors they favor most are bright red, pink, and orange, so a sunny pink planting handles the bird side of your garden with little planning. Keep that part simple and spend your effort on the half of the bed bees can see.
Choose your pollinator garden colors in pairs and your whole bed pays off. Put pink and red on one side to pull in butterflies and hummingbirds, then run blue and yellow down the other side for the bees. Work in a few wide flat faces and dense clusters so butterflies have somewhere to stand. A single color theme photographs well, but a bed built on pink alone gives your bees almost nothing to work with.
Read the full article: 10 Pink Flowers and What Makes Them Pink
