Keeping flowers fresh in the extreme heat
However, during periods of extreme heat, flowers can struggle far more than people realise. Just as we become tired and dehydrated in very hot weather, cut flowers can quickly lose moisture, wilt prematurely and shorten their vase life if they are not properly cared for.
At Grand Flowers, we condition and prepare our flowers carefully before they leave the shop, but a little extra attention during hot weather can make a huge difference to how long your bouquet lasts.
Why Heat Affects Flowers So Quickly
Fresh flowers are living products. Even after they are cut, they continue to drink water through their stems.
In very warm temperatures, flowers lose moisture much faster through their petals and foliage. If they cannot replace that water quickly enough, they begin to droop, wilt or develop dry, tired-looking edges.
Some flowers are particularly sensitive to heat, including:
- Hydrangeas
- Roses
- Delphiniums
- Sweet peas
- Tulips
- Peonies
This does not mean they cannot be enjoyed during summer — simply that they benefit from a little more care and attention.
Keep Flowers Away From Direct Sunlight
This is one of the most common mistakes people make.
A bouquet may look beautiful sitting in a sunny window, but direct sunlight dramatically increases the temperature of both the flowers and the water in the vase. This speeds up dehydration and bacterial growth.
Instead, place flowers:
- In a cool room
- Away from conservatories and south-facing windows
- Out of direct afternoon sun
- Away from radiators or heat sources
Bright indirect light is perfectly fine — intense heat is the problem.
Change the Water More Frequently
In hot weather, vase water warms up very quickly, which encourages bacteria to develop faster. Bacteria block the stems and stop flowers drinking properly.
During extreme heat:
- Change the water every 1–2 days
- Wash the vase thoroughly each time
- Re-cut stems by around 1cm at an angle
- Remove any foliage sitting below the waterline
Fresh cool water can dramatically extend vase life.
Use Flower Food Properly
Flower food really does help.
It contains:
- Nutrients to feed the flowers
- Acidifiers to improve water uptake
- Ingredients that slow bacterial growth
A common mistake is using only part of the sachet. Always use the full amount recommended for the vase size and replace it when changing the water.
At Grand Flowers, we include flower food because properly conditioned flowers should last beautifully when cared for correctly.
Keep Flowers Cool Overnight
Professional florists keep flowers in cool conditions for a reason.
During very hot spells, moving bouquets into a cooler room overnight can help preserve them. Some customers even place flowers in a utility room or cooler hallway during heatwaves.
You do not need refrigeration — simply avoiding excessive overnight warmth can help flowers recover and rehydrate.
Watch Out for Fruit Bowls
Interestingly, ripening fruit releases ethylene gas, which can shorten the life of flowers significantly.
Keep bouquets away from:
- Fruit bowls
- Bananas
- Apples
- Tomatoes
This is especially important during summer when kitchens become warmer.
Choosing Flowers That Cope Better With Heat
Some flowers naturally tolerate warm weather better than others.
Generally reliable summer performers include:
- Sunflowers
- Chrysanthemums
- Alstroemeria
- Carnations
- Lisianthus
- Orchids
At Grand Flowers, we often adjust our flower selection slightly during hotter periods to ensure bouquets continue to perform beautifully for our customers.
A Final Thought
Fresh flowers are naturally seasonal and ever-changing — part of their beauty lies in that. During periods of extreme heat, a little extra care goes a very long way.
A well-conditioned bouquet, fresh water, cooler positioning and regular maintenance can easily add several extra days of enjoyment.
And during the hottest days of the year, there is still nothing quite like walking into a room filled with beautiful fresh flowers.
