Flower Grading: What Stem Length and Grade Mean

Two bunches of the same variety in the same colour can differ in price by a factor of three, and the reason is usually grading. It is the least visible part of flower pricing and the easiest to use once understood.

Stem Length Is the Primary Grade

Roses are graded and sold by stem length in centimetres — commonly 40, 50, 60, 70, 80 and occasionally longer. The number is on the box, and it is the single largest determinant of price.

Longer stems cost more for a straightforward reason: they take longer to grow and yield fewer per plant. A grower cutting long is harvesting less frequently and getting fewer stems per square metre, so the cost per stem rises steeply with length.

Length also correlates with head size. A 70cm rose generally carries a larger, heavier bloom than a 40cm one of the same variety, because the plant had longer to develop it. So the long grades are buying two things at once.

What Length You Actually Need

This is where money gets wasted, in both directions.

For a tall vase where the flowers stand well clear of the rim, long grades are necessary and buying short is a false economy — the arrangement will look sunken.

For a low bowl, a compact hand-tie, or anything on a dining table, long stems are cut off and discarded. Buying 70cm roses to make a low centrepiece means paying a substantial premium for stem that goes in the bin.

The useful question when ordering is what the finished height needs to be, plus the depth of the vessel, plus a little for re-cutting. Anything beyond that is waste.

The Other Grading Criteria

Length is the headline; several other things are assessed.

Head size, measured or estimated, and priced accordingly within a length grade.

Stem straightness and strength, since a stem that cannot hold its head is a defect regardless of length.

Uniformity within the bunch — for event work this matters enormously, since forty arrangements must match.

Stage of opening, which should be consistent across a bunch so they open together rather than over five days.

Freedom from damage: bruising, botrytis spotting, insect damage, broken guard petals.

Guard Petals, and What Their Absence Means

A rose arrives with one or two outer petals that are coarser, sometimes marked or greenish, protecting the bloom in transit. These are guard petals and they are meant to be removed before the flower is displayed.

Their presence on a bunch you are buying is a good sign — it means the flower has not been handled much and is likely fresh. Their absence on a rose that looks slightly open is worth noticing, because removing them is also how tired stock is made to look presentable.

This is one of the more useful things to check at a market or a supermarket shelf.

Bunch Counts and What a Wrap Contains

Wholesale flowers are sold by the bunch, and the count varies by crop in ways that are not obvious.

Roses are conventionally wrapped in twenties or twenty-fives. Tulips commonly come in tens. Chrysanthemum sprays and alstroemeria are usually sold in fives or tens by weight rather than by stem. Foliage is generally sold by the bunch with no fixed count at all.

This matters when comparing prices. A price per bunch means nothing without the count, and a cheap bunch of roses is frequently a bunch of twenty rather than twenty-five.

What Grade Does Not Tell You

Two things it says nothing about, and both matter more than people assume.

Vase life. Grading assesses appearance at the point of sale, not longevity. A magnificent 70cm rose that has been through a broken cold chain will fail faster than a modest 50cm one that was handled properly, and nothing on the box distinguishes them.

And scent, which is not graded at all and which commercial breeding largely removed regardless of grade.

How to Use This When Buying

Specify length when it matters and let it go when it does not. Telling a florist the finished height rather than asking for the best available is the difference between paying for stem you use and stem you discard.

For a gift where impact matters, length and head size are where the money should go — a dozen long-stemmed roses with substantial heads reads as considerably more generous than two dozen short ones, and our The Classic Red is built on that principle.

For volume work, low arrangements, or anything where the stems will be cut down anyway, shorter grades are the same flower at a fraction of the cost, and the difference is entirely invisible in the finished piece. This is the single most effective way to make a modest budget produce a generous-looking arrangement, and it is why our Designer Flower Mix can carry more material for the money than a specified order at the same price.