Frequently Asked Questions – 100 questions about flowers

It almost always comes down to damage in the flower's microscopic vascular system (xylem). During delivery, the stem can dry out slightly, cool down and warm up again, which easily creates air pockets (embolisms) that break the water column. At the same time, the cut surface leaks organic material that becomes food for bacteria – and bacteria build biofilm that acts like plugs. Some species also leak latex or phenols that oxidise and clog the vessels. The quickest fix is therefore unglamorous but effective: wash the vase thoroughly, cut off 1–2 cm with a sharp knife (scissors crush), remove leaves below the waterline, change water within the first day and keep cool. It's not magic – it's plumbing in plant format.

Roses droop when the flower head tissue loses turgor (cell pressure). This happens when water supply cannot keep up with evaporation. Most common is a combination of xylem blockage near the cut (bacteria/biofilm/particles) and crushing damage from scissors. This restricts the flow and petals end up in water shortage. For roses, this often helps: fresh cut with a knife, clean vase, cool conditions for the first day, and ensuring no leaves are in the water.

pH primarily affects microbes and water flow. Slightly acidic water makes it harder for many bacteria to grow, which reduces biofilm and blockage formation in xylem. It can also affect mineral solubility so you get less scaling. But pH is never a replacement for hygiene: a dirty vase beats perfect pH every single day.

Sugar can provide energy and help buds open – but it's also a five-star restaurant for bacteria. Without antibacterial components and proper good hygiene you get rapid microbe growth, slimy water and restriction of water uptake. That's why commercial cut flower food works better: it typically combines carbohydrates with measures that slow bacteria and often includes pH adjustment.

Ethylene is a gaseous hormone signal that controls ripening and ageing. Stress (cold, damage, drying out) can trigger production, and fruit can release ethylene during ripening. Ethylene-sensitive flowers respond by accelerating senescence: petals loosen, leaves yellow and the bouquet can feel like it went from wow to goodbye in an afternoon. Practical tip: keep bouquets cool and ventilate. And don't place ethylene-sensitive flowers next to the fruit bowl.

Tulips continue to grow after harvest and are very responsive to light (phototropism) and temperature. This means the stem actively bends towards light sources whilst the tissue continues to stretch. Heat and low humidity increase evaporation and can create softer stems. To reduce the drama: keep them cooler, avoid direct sun or heaters, use a vase that provides support and turn the bouquet if light comes from one side.

Scorched edges are often localised drying and cell damage. The edges are most exposed to air and lose water faster – especially in warm, dry air or draughts. Transport stress (rapid temperature changes) can cause microscopic damage that later shows as brown spots. Solutions: keep cool, no heat sources nearby, and ensure good water flow (clean vase + fresh cut).

Almost always: temperature, hygiene and the supply chain. Every degree warmer increases respiration and evaporation, and bacteria multiply faster. A dirty vase gives bacteria a head start from minute one. Crushed cut surface and leaves in the water accelerate blockage formation. Differences in how fresh the flowers actually were when you bought them also matter.

Leaves submerged in water break down and leak organic material. This becomes food for bacteria that form biofilm and can block xylem. Besides, decomposition can lower oxygen levels in the water and create an environment where microbes thrive even better. It's the simplest rule that gives the biggest effect: nothing green in the water, full stop.

For certain woody stems, lukewarm water can initially improve flow because viscosity decreases and it can help start water uptake in more resistant vessels. But warm water over time is poor: bacteria grow faster and the flower respires more, which shortens vase life. A reasonable strategy is: get uptake going – then keep it cool.

Senescence is programmed ageing: gradual breakdown and redistribution of resources controlled by signals (including ethylene in sensitive species). Sudden collapse is often hydraulic failure: water uptake stops rapidly (embolisms or blockage) and tissue loses turgor in hours. The difference matters because collapse can sometimes be rescued with fresh cut + hygiene + cool conditions, whereas senescence is more a case of thank you for the memories.

Buds need both functioning water uptake and enough energy and reserves to expand cells and open petals. If they were harvested too early they may lack reserves and stall. If xylem flow is poor (blockage or crushed cut) water doesn't reach them. Transport stress (cold or heat shock) can also disrupt the opening process.

It's biofilm: bacteria multiplying rapidly and building a slimy mat. This happens if the vase wasn't properly clean, if stems leak a lot of plant sap, if the water was warm, or if you introduced microbes via hands or tools. The cure is brutally simple: wash the vase, change the water, cut a fresh stem.

Hard water contains more calcium and magnesium, which can affect scaling in the vase and how pH behaves (buffering). It can also affect how certain cut flower foods work. The effect on the flower's actual lifespan varies greatly between species and is often less important than temperature and hygiene.

Fragrance consists of volatile compounds affected by temperature, light, air circulation and circadian rhythm. In the shop there are many bouquets that together build fragrance volume, and air flow can carry the scent better. At home, fragrance can feel weaker if the room is still or if you become accustomed quickly.

Because fruit can release ethylene as a gas. Ethylene disperses in the air and can trigger ageing in ethylene-sensitive cut flowers. So there's no need for contact – just the same air.

More water isn't always better if it means leaves end up below the waterline, or if you don't change the water. Then bacteria have more volume to grow in, more organic load and more time before you notice something's gone wrong. Optimal level is: enough for uptake – but without anything green sitting and rotting in the water.

Scissors compress and crush tissue, which can squeeze shut the xylem and create poor flow. A sharp knife gives a clean cut surface with open vessels, which improves water uptake. It's the same principle as not wanting to squeeze a straw when you're trying to drink.

Pulsing is a controlled pre-treatment where flowers receive a solution for a certain time (often carbohydrates + antimicrobial components + sometimes pH adjustment). The goal is to fill energy stores, improve water uptake and increase vase life during transport and shop storage.

Temperature. A cool location slows respiration, microbe growth and ethylene effects. Many hunt for secret tricks, but a bouquet standing warm in dry air is essentially on fast-forward towards wilting. Put the effort into cool + clean + good cut.

Carnations, sweet peas, delphiniums, alstroemeria and certain orchids are classically ethylene-sensitive. Roses, tulips and chrysanthemums are more tolerant but not immune. In practical terms: sensitive varieties shouldn't stand near fruit bowls or exhausts.

It varies enormously depending on variety, handling and conditions. Chrysanthemums and alstroemeria can last 2–3 weeks under good conditions. Roses often land on 5–10 days. Tulips and daffodils perhaps 5–7 days. Sweet peas might be done in 3–5 days.

Peonies have large, thin petals that evaporate water rapidly once the flower is open. Besides, they're sensitive to heat and dry air. The trick is to buy them as buds – then you get to see the whole opening process and they last longer overall.

Sometimes. If the problem is hydraulic (blockage, air pockets) a fresh cut under water + clean vase + cool location can give a second chance. If it's senescence (natural ageing) or serious cell damage there's not much to do. Rule of thumb: the faster you act, the better your chances.

Supply and demand in its purest form. Demand for red roses explodes around 14th February while production can't increase as quickly. Transport and logistics get more strained, and quality standards are high.

Cut roses are bred for long vase life, uniform size, transport durability and often less fragrance. Garden roses prioritise scent, flower form and garden qualities – but can be more fragile as cut flowers.

Fragrance has been deprioritised in cut rose breeding because vase life, colour and form were more important to the industry. Fragrance costs energy from the plant and can shorten lifespan. The result is that many modern cut roses are unscented.

Check the stem's cut surface – it should be light, not dark brown or slimy. The petals should sit firmly and not loosen with light touch. The leaves should be green and firm, not yellowing or drooping. The bud should feel firm but not stone hard.

It's pollen from the stamens. When lilies open the pollen-bearing stamens are exposed, and the pollen is intensely coloured and sticks easily. The trick is to carefully cut off the stamens before they start releasing pollen.

It used to be standard advice, but modern research says no. Crushing damages tissue, creates more surfaces for bacteria to grow on and can actually worsen water uptake. A clean, straight cut with a sharp knife gives better results.

Daffodils contain mucilage and alkaloids that leak out when cut. This substance can actually damage other flowers in the same vase by blocking their vessels. The solution: let daffodils stand in their own water for at least 6 hours after cutting.

Generally, flowers with similar water needs and that don't release harmful substances work well together. Roses, lisianthus, alstroemeria and chrysanthemums are common bouquet-friendly varieties. Avoid mixing daffodils or poinsettias with others without pre-treatment.

Indirect light is usually best. Direct sunlight warms up the flowers, increases evaporation and speeds up ageing. Some flowers (like tulips) respond strongly to light and bend towards it. A bright spot without direct sun is the golden middle ground.

Leaves are expendable for a cut flower. When the plant no longer has roots and has limited energy it prioritises the flower over the leaves. Chlorophyll breaks down, nutrients are redistributed and leaves yellow.

Absolutely. Dahlias, zinnias, cosmos, sunflowers, sweet peas and delphiniums are excellent for home growing. The advantage is you can harvest exactly when you want and get flowers that have never needed transport.

A bouquet is flowers tied together, usually by hand, that can go in a vase of your choice. An arrangement is flowers arranged in a container, often with floral foam (oasis) or other structure that holds them in place.

Floral foam is a sponge-like material that absorbs water and holds flowers in place in arrangements. It's practical for florists but can be difficult to water sufficiently. For vase life at home, a clean vase with clean water almost always wins.

Keep the bouquet upright as much as possible. If the stems have been in water, wrap the cut ends in damp kitchen roll and cover with clingfilm for short journeys. Avoid leaving crushed areas or bending stems beyond their natural angle.

A tiny amount of bleach can slow bacterial growth, but it's a crude approach. Commercial cut flower food is specifically formulated to manage both energy and microbes far more effectively. Bleach won't help if hygiene is poor elsewhere, and it can burn your hands.

Paper wrapping protects flowers from damage and drying during transport. Wrapped bouquets can last several hours, but flowers will use their reserves and start to wilt if they don't reach water within a reasonable time. Remove wrapping and cut stems as soon as you get home.

At least every 2–3 days, or earlier if it becomes cloudy or slimy. Every time you change water, also make a fresh cut (about 1 cm) to remove any blockages that may have formed.

If damage is minor (bent stems, crushed leaves), many can recover with a fresh cut and cool storage. If flowers are severely damaged – bruised petals, crushed heads – recovery is unlikely. Contact your florist immediately with photos.

Desiccants absorb excess moisture during post delivery to reduce mould and bacterial growth. They help protect flowers during the journey, especially in warm or humid conditions.

An angled cut provides a larger surface area for water uptake, which can be beneficial. A straight cut is equally fine – what matters most is that it's clean, fresh and made with a sharp knife.

Petal attachment strength varies by species. Some flowers like garden roses naturally shed petals as they age – it's part of their programme. Others like carnations and alstroemeria hold their petals much longer. Rough handling during transport accelerates shedding.

It's very difficult. Cut flowers are often from cultivars selected for bloom rather than rooting ability, and they've typically been treated with growth regulators and fungicides. Best to buy nursery stock.

Low humidity increases evaporation, which forces flowers to lose water faster and can cause wilting and petal edge browning. Moderate humidity (around 60–70%) is ideal. Misting can help temporarily but wet petals can develop fungal spots.

Availability, demand and logistics drive prices. Seasonal flowers are cheaper when in local season. Valentine's Day, Mother's Day and Christmas dramatically increase demand for certain flowers, pushing prices up. Supply chain stress also raises costs.

Roses, gerberas, lisianthus and alstroemeria tend to have lower pollen counts. Avoid lilies (high pollen), freesias and heavily fragranced varieties. Remove stamens from lilies to eliminate pollen entirely.