Last week in our Floral community, members engaged in a lively exchange on the effects of UV light on various cut blooms, sparking interest in both scientific and aesthetic perspectives. The forum also saw a humorous yet informative thread about the peculiar behavior of titan arums, providing a mix of entertainment and botanical curiosity. Additionally, the durability of Alstroemeria as a cut flower was a hot topic, with many sharing tips on extending vase life.
This Week’s Hot Topics
Which cut blooms pop brightest under UV
This thread explores the fascinating effects of UV light on different cut flowers. It’s sparked a conversation about how florists and enthusiasts can use UV to enhance floral displays. Read more here
Did my titan arum just heckle me
In this amusing yet insightful discussion, members share experiences with the unpredictable titan arum. It’s a lighthearted look at the quirks of this giant plant. Read more here
Alstroemeria: the longest-lasting cut bloom
Discover why Alstroemeria might be the best choice for long-lasting floral arrangements. This thread is full of practical advice for extending the life of these resilient blooms. Read more here
Looking forward to another week of insightful and enjoyable discussions. Have a great week ahead!
of practical advice for extending the life of these resilient blooms. Read more here Looking forward to another week of insightful and Co-sign: my Alstro lasts 5–7 days longer when I pre-chill at 34°F for 4 hours, then hydrate in 1 qt water + 1 tsp sugar + 1/4 tsp bleach; I skip the sugar if they’re headed to a warm window.
Same here — curious if others are actually seeing dates or just memos.
Tried a cheap 365 nm UV pen last week on tulips and roses — , even 20–30 seconds bronzed tulip edges by morning, so I only use it now to spot hidden botrytis, not to boost anything. For Alstro, a 2-hour pre-hydrate in plain, cool water before adding food consistently adds a couple days for me; if I’m rushed, a tiny pinch of citric acid works too. @Guide have you noticed UV making pollen fluoresce differently by species?
In my shop I fixed the UV issue by adding 99% UV‑blocking film to the front windows and leaving the LEDs alone; tulips stopped bronzing without the warmer cast @tommy_82 mentioned — just watch for midday heat buildup. Also, titan arum’s “perfume” still beats my exhaust fan.
UV on spring stuff drives me nuts. Quick fix that worked for me: I slid a sheet of OP-3 museum acrylic in front of the window display instead of swapping LEDs, and the bronzing on ranuncs/lisi went away without the warmer cast — about $45 for a 24×36 from the framing shop. It does knock brightness a hair and can glare, so I tilt it a few degrees and rotate anything tender after 2 pm; @karenj_76 your 99% film is great, this is a renter‑friendly alternative.
I got better results treating the glass instead of swapping LEDs: 3M Prestige 70 UV film on the front window cut fade on ranunculus without changing the look; only caveat is a slight heat bump around noon. @amelia_floral22 spec sheet I used: 3M™ Automotive Window Film Color Stable Series | 3M United States — and unlike a titan arum, it doesn’t stink up the shop.
Quick tip: a small panel of UV‑blocking acrylic (Acrylite OP‑3) set between the window glass and the arrangement cut my tulip fade without affecting color — sunscreen for blooms. It’s pricier than @tommy_82’s cards and can add a bit of glare/dust, but it’s removable and sturdy; spec: https://www.acrylite.co/us/en/products/acrylite-op-3.
Swapped my clear vases for amber apothecary bottles near the south window and my Alstro held color about a day longer through the 11–2 sun blast… The amber knocks down UV without messing with the window, the thrifted ones were ~$3, and — caveat — it warms the water, so I add an ice cube at setup; it beat my LED swap, @leonard88.
I started mapping UV hotspots with a $20 meter and just moving arrangements 18–24 inches off the glass added a day on my Alstro and tulips; “distance is free UV control.” If you’re stuck near a window, UV sleeves on fluorescents (Rosco #3400, https://us.rosco.com/en/product/uv-absorbing-sleeves) helped more than tweaking LEDs for me — titan arum still tried to ‘perfume’ the back room, but at least my ranunculus didn’t fade as fast.
On my south window, I use a static‑cling UV window film (the cheap Gila kind, about $15) just on the lower pane during the 11–2 blast, and it consistently buys my Alstro an extra day without a color cast. I’m with @Ken on moving pieces off the glass, but the cling film is my backup when I can’t rearrange; only caveat is it softens window photos, so I peel it off for shoots. The corpse‑flower thread cracked me up, but the UV tests were the real win last week.
I got similar gains by taping a strip of Lee 226 UV 400 gel over my display lamp — my Alstro held color about a day longer, tiny sunglasses for the bouquet. Caveat: it warms the scene a touch, so I tweak white balance; details: https://leefilters.com/lighting/colour/226-uv-400.
, Alstro leaf yellowing drives me nuts, so I hung a cheap UPF‑50 sheer over the front window only during the 11–2 sun and swapped the display lamp to a 3000K high‑CRI LED; I got about a day and a half more before they faded. Sheers are easier than films, but watch heat buildup and add a tiny fan if the shelf warms. Handy reference that pairs with the UV chat: https://content.ces.ncsu.edu/postharvest-handling-of-cut-flowers — and that titan arum “warm-up” stunt had me move anything fragrance‑sensitive away from vents.