Prepping & conditioning flowers

Conditioning is the unglamorous half of floristry and the half that decides whether your flowers are standing at 6 p.m. Nearly every DIY wedding disaster story is a conditioning story. This module is the most important one on the site.

1. Why flowers wilt and what stops it

A cut stem wilts for one of three reasons, and each has a fix:

• The stem is blocked. Air gets drawn into the cut end (an embolism), or bacteria plug the xylem. Fix: re-cut cleanly, at an angle, with sharp tools, ideally under water or straight into water; keep water clean with a biocide (that is what flower food's third ingredient is).
• The flower is losing water faster than it takes it up. Heat, wind, dry air, big leaves. Fix: strip foliage, keep cool and out of moving air, give it hours in deep water before you ask it to work.
• The flower has run out of fuel. Cut flowers are still alive and burning sugar. Fix: flower food (sugar), and cold to slow metabolism.

Everything below is a variation on clean, cut, feed, cool, wait.

2. The processing station

Set this up before flowers arrive, not while the box is sitting on the porch.

• Location: the coolest room you have with a sink nearby. A basement, a garage on a cool day, an air-conditioned room with blinds down. Target 55–65°F for working; cooler for holding. Never a sunny kitchen.
• Buckets: scrubbed with dish soap and a splash of bleach, rinsed. Plastic only; no galvanized metal. Fill one-third to one-half with cool water plus holding solution before you start cutting. For a wedding order you need far more buckets than you think: roughly one 2-gallon bucket per 20–25 mixed stems, and one 5-gallon bucket per 10–15 hydrangea heads or 2–3 bunches of foliage.
• Surface: a table with a plastic cloth, a trash bin or compost tub at your hip, towels, snips, stripper, quick dip in a small cup, flower food pre-measured.
• Labels: painter's tape and a marker on every bucket: flower, date received, where it goes.
• Water: cool tap water is fine. Avoid softened water (salt). If your tap water is very hard or alkaline, flower food's acidifier is doing real work; do not skip it.

3. The universal processing method

1. Unpack immediately. Flowers shipped dry are thirsty and dehydrating further every minute. Cut the sleeves, remove rubber bands only if they are crushing, lay bunches out.
2. Inspect and triage. Broken heads, mush, mold: out. Guard petals on roses (the outer two or three bruised petals): off. Note anything that looks short.
3. Strip. Remove every leaf that will sit below the waterline and most leaves above it on anything that will be in a bouquet or low design. Leaves lose water; the flower needs it.
4. Cut. At least one inch off, at a 45° angle, with sharp snips, and get the stem into water within seconds. For badly dehydrated stems, cut under water. Do not smash woody stems; it was once taught and it encourages bacteria.
5. Dip. Stems that arrived dry: dip the fresh cut 1–3 seconds into a hydrating "quick dip" solution, then straight into the bucket. This lowers pH and helps uptake.
6. Into holding solution. Cool water with low-sugar flower food, deep enough to cover several inches of stem but not the leaves.
7. Rest. Minimum 2–4 hours before you do anything with them; overnight is better; most flowers want 12–24 hours to fully rehydrate. Dark, cool, still air.
8. Re-cut before designing. Every stem gets a fresh half-inch cut as you place it. Every piece you build gets fresh water with full-strength flower food.

4. Flower food, dips and sprays

Buy commercial holding solution in bulk (a pound of powder or a quart of concentrate). It is cheap and the single most effective product in this module. Reused solution loses most of its benefit; make it fresh when you refill.

5. Cold storage at home

A florist's cooler runs 34–38°F at high humidity. You do not have one. What you have:

• A clean refrigerator with no produce in it. Best for personal flowers, cut hydrangea heads in a bucket if it fits, and finished bouquets overnight. Set it to 36–40°F; never let anything touch the back wall where it can freeze. A second fridge or a borrowed garage fridge is the DIY-er's best investment for flower week. Remove every apple, banana and tomato first (see ethylene).
• A cool, dark room. A basement at 55–60°F or an air-conditioned bedroom at 62–65°F with blinds closed and the fan off is a perfectly good holding room for 2–3 days. Most DIY weddings are done this way.
• Night air. In spring and autumn in a temperate climate, nights often run 50–60°F. A screened porch or garage overnight, brought in before the sun hits, works for hardy material (hydrangea, foliage, grasses).
• Not a chest freezer, an uninsulated car, a sunny room, or anywhere near a furnace or a dehumidifier running hard.

Humidity matters as much as temperature. A fridge dries flowers; loosely tent them in plastic (a dry-cleaning bag, an open-topped bin liner) to hold moisture while allowing some air. Mist hydrangea; do not mist roses (botrytis).

6. Ethylene and other killers

• Ethylene is the ripening gas. Sources: fruit (especially apples, bananas, avocados, tomatoes), car exhaust, cigarette smoke, decaying plant matter, and the flowers themselves as they age. Sensitive crops: carnations, delphinium, snapdragon, sweet pea, lisianthus, scabiosa, gypsophila, stock, many roses, and to a lesser degree hydrangea. Symptoms: petal drop, bud drop, sleepiness, failure to open. Fix: keep flowers away from produce and exhaust, keep buckets clean, remove dead material daily, keep cool (ethylene does far more damage warm).
• Heat. Every 18°F roughly doubles the metabolic rate. Flowers at 75°F age about twice as fast as at 57°F.
• Direct sun and wind. Transpiration. Keep processed flowers out of both until they are placed.
• Dirty water. Cloudy water means bacteria, which means plugged stems. Change bucket water every 2 days (daily for zinnias, sunflowers, stock, celosia, amaranthus, which foul water fast).
• Crowding. Packed buckets crush, bruise, and trap heat. Give heads room.

7. How far ahead: by flower family

This is the question you asked the course to answer, so here is the short version. The flower guide has it stem by stem.

8. Deep dive: hydrangea

Hydrangea is the most-used and most-wilted wedding flower. It has thick woody stems that seal over, enormous leaf area, and a head that transpires like a sponge. It is also the one flower that can take up water through its petals, which is the basis of every rescue trick.

Harvesting from a garden (Limelight and other paniculata)

• Cut mature heads only. A paniculata head is ready when the florets feel papery and slightly firm rather than soft and fleshy, which for Limelight means from late August through its antique green-cream-rose phase in September and October. Soft, newly-opened heads wilt within hours no matter what you do. The antique stage is both prettier for your palette and far tougher; many of these heads will dry in place in the arrangement.
• Cut early morning when the plant is fully turgid, or in the cool of evening. Never midday.
• Carry a bucket of water into the garden and put each stem in within seconds of cutting. Cut long; you will re-cut.
• Strip most leaves immediately. Leaves are the enemy on hydrangea. Leave one pair at most if you want green in the design, and plan to remove it if the head flags.
• Re-cut inside at an angle, then one of: dip the cut 2–3 seconds in alum powder (grocery spice aisle), or stand the bottom inch in just-boiled water for 30 seconds with the head shielded from steam, then into deep cool water with holding solution. Both methods stop the stem sealing. Alum is easier at volume.
• Deep water, cool room, overnight. Hydrangea wants more water depth than most flowers; half the stem submerged is fine.
• Timing for an event: cut in two waves. Station and ceremony heads at T-3 or T-2, dining-table heads at T-2 or T-1 (morning). This spreads bucket load and keeps the flowers people see closely the freshest. Antique heads cut at T-3 will be fine.

Bucket math

Antique Limelight panicles are big. Count on 10–15 heads per 5-gallon bucket (fewer if stems are long and leafy) and 5–8 per 2-gallon. For a program of 200–300 heads, that is 20–30 five-gallon buckets in the house at once if you cut in one wave, which is why the two-wave cut matters. You can also hold some heads dry (see below).

The dry hold

Antique-stage hydrangea dries beautifully. Heads cut at the papery stage and stood in two inches of water that is allowed to evaporate over a week become dried hydrangea with the same color. These need no bucket and no cooling, can be cut weeks before the event (or a year early as a test), and are ideal for buffet corners, welcome tables, and anything that gets moved around. Fresh heads for the dining tables and ceremony; dried heads for the stations is a real strategy, and it rebuilds the margin in your head count.

Rescue

• Submerge the whole head in a sink or tub of cool water for 30–60 minutes (up to a few hours for a badly wilted head). Re-cut, alum or hot water, back in deep water. Works on most heads that have not been wilted more than a day.
• The hot water bath: re-cut and stand the stem in 1–2 inches of just-boiled water for 30 seconds to a minute, head wrapped in paper to shield from steam, then move to cool deep water.
• In an arrangement: mist heavily, and if one head is flagging, pull it, submerge it, re-cut, put it back. Keep a few spare heads in a bucket under the table at the venue.

9. Deep dive: dahlias, garden roses, lisianthus

Dahlias

• Buy or cut fully open. Dahlias do not open after cutting; a bud stays a bud.
• Hollow stems trap air. Re-cut and stand in hot water (about 160–170°F, hotter than a hot tap but not boiling) for an hour as it cools, or a 10-second dip in just-boiled water, then into cool holding solution. Steam off the petals.
• Vase life 3–5 days even when perfectly handled. Order to arrive T-2, condition, design T-1, keep cold. Dinner-plate varieties are the shortest-lived; ball and pompon forms last best.
• Local farms in late September will have the best dahlias you can get. If you add dahlias to the design, that is where to buy them.

Garden roses

• Arrive tight, open over 2–3 days at room temperature in full-sugar solution, then slow them down cold once they are where you want them.
• Remove guard petals. You can "reflex" the outer petals back with your thumbs for a fuller, more open look.
• Bent neck: re-cut, quick dip, hot water for 20 minutes, wrap the heads upright in a newspaper cone so they rehydrate straight.
• Strip thorns with a stripper or a gloved hand for anything in a bouquet.

Lisianthus

• The DIY-er's best friend: looks like a rose, lasts two weeks, cheap, comes in ivory, champagne, and dusty mauve. Buy T-4 so the buds open.
• Ethylene sensitive: keep away from produce.
• Stems are weak; use for secondary and in bud vases rather than as a structural focal.

10. Rescue techniques, general

11. Do: the processing drill

Do this once now, with whatever is in the garden or the grocery store, and again at every practice session. The goal is to make the method automatic so that flower week is muscle memory.

1. Set up the station before you have flowers: three clean labeled buckets with holding solution, snips, stripper, towels, a cup of quick dip or a dish of alum, a timer.
2. Process 30 stems against the clock. A professional does a bunch of 10 in about a minute. You are aiming for 30 stems in under 10 minutes without skipping steps. Note your time.
3. Hydrangea test, if you have the garden: cut six heads at the papery stage. Process three with alum and three with hot water. Put one of each in a sunny kitchen, one of each in the basement, and one of each in the fridge. Photograph at 12, 24, 48 and 72 hours. You now know your own house.
4. Dry hold test: cut six more heads, stand them in two inches of water in a dark room, and leave them for two weeks. These are your first station flowers.
5. Bucket count: count how many heads actually fit in your 5-gallon bucket without crushing. Write it on the calculator page assumptions.

Watch and read

• Flower Moxie, Flower Care 101, and their printable Quick Start flower care guide (PDF). The best free DIY processing walkthrough; it is written for exactly your situation, a box arriving at a house.
• FiftyFlowers, How to keep your event flowers fresh.
• FloraLife's care and handling library: crop-by-crop processing sheets written for the trade. Search their site for "garden roses," "hydrangea," "dahlia."
• Longfield Gardens on keeping cut dahlias fresh.
• Floret Flowers blog: the farmer-florist's harvesting and post-harvest notes, variety by variety. Search "harvest stage."

• I set up a processing station and processed 30 stems in under 10 minutes.
• I ran the hydrangea alum-vs-hot-water, kitchen-vs-basement-vs-fridge test and photographed it.
• I started a batch of dried antique hydrangea.
• I know my per-bucket head count and have a plan for where buckets go in flower week.
• I bought bulk holding solution and a quick dip.