From trend report to supermarket shelf: the 18 month journey of a seasonal collection

How a colour in a forecast becomes a product in your basket, and why the whole process starts long before you see it.

Every spring, I sign off products that will not reach a shelf for over a year. While shoppers buy this season's egg cups and bunny planters, I am already working on the season after next. Most people find this strange. Even people in retail often see only their part of the process. Buyers see their piece. Designers see theirs. Factories see theirs. Very few people have stood at every station of the line.

I have spent 14 years building seasonal collections for European mass retailers, including M&S, Lidl, Aldi, Tesco, Hornbach, Blume2000, Salling Group and REWE through private label and wholesale manufacturing companies like Dymak and LiveTrends Design Group. This post walks you through the full journey. If you work in retail, product development or sourcing, you will recognise parts of it. If you are new to this world, you will understand why good seasonal ranges never happen by accident.

The timeline at a glance

The active development phase runs about five months. This would, for example, include a Spring/Summer assortment, which includes: Spring Everyday (around 30 SKUs), Easter (around 40 SKUs), Valentine's Day (around 50 SKUs), Mother's Day (around 30 SKUs) and Summer (around 20 SKUs)

• Weeks 1 to 3: Trend research and a trend guide for the purchasing team

• Month 2: Design, range planning, and deciding which past items make a comeback

• Months 3 to 5: Sampling and approval

• After that: Orders, production, shipping, launch

Five months sounds fast. It is. The pace only works because every stage feeds the next one with clear decisions. Cut corners early and you pay for it in sampling. Dither in sampling and you miss your shipping window. There is no slack hidden anywhere in this plan.

Stage 1: Trend research (weeks 1 to 3)

Everything starts with research. Three weeks to read the season, filter the noise, and hand the purchasing team a guide they can act on. I use paid forecasting services like WGSN, but the forecast itself is only raw material. The real work is filtering. A forecast might present eight or nine design directions for one season. A supermarket range can carry two, maybe three. So I test each direction against a few questions.

Does the trend show up across several categories at once? A colour that appears in fashion, interiors and packaging has more force than one that only lives in luxury furniture. Does it work at my price points? Some trends depend on materials or techniques that fall apart below a certain cost. A hand knotted detail looks beautiful in a forecast image. At a €3.99 retail price, it becomes a printed pattern or it dies. Can my customer read it in two seconds? Shoppers give a supermarket displays sometimes only a glance. The trend needs to communicate at walking speed.

The output of these three weeks is a trend guide for the purchasing team. Short, visual, decisive. It names the directions for the season, shows the colours with exact Pantone references, and explains in plain words why each direction earned its place. A good guide lets a buyer defend the range in any meeting without me in the room. However, I am usually in the room and I am the one presenting it.

Stage 2: Design and carryover decisions (month 2)

Now the abstract becomes concrete. One month to turn directions into an actual range.

Two things happen in parallel here. New items get designed. And past items get judged.

The second part is less glamorous but just as important. Every seasonal range contains carryover: items from previous collections that come back, sometimes refreshed in the new season's colours. Sell-through data decides. A vase that sold 90 percent at full price has earned another year. A lantern that hit the markdown bin in week three has not, no matter how much anyone loved the design.

Carryover is not a compromise. It is smart range building. Proven items carry the commercial risk so the new designs can take the creative risk. For the new items, this month also produces the CMF specification. CMF stands for colour, material and finish. It is where design intent becomes measurable. "Soft green" means nothing to a factory. "Pantone 14-4807 TCX on matt glazed stoneware" means one exact thing.

I specify every colour with a Pantone reference. Every material by type. Every finish with a physical sample or a clear standard to match. This precision matters more than any other single thing in the process. A vague spec in month 2 becomes a wrong sample in month 4, and by then the clock is running out.

Stage 3: Sampling and approval (months 3 to 5)

The specs travel to factories, most of them in Asia. This is where many collections quietly go wrong. A good factory briefing package contains the range plan, the CMF spec, technical drawings, reference images and target costs. It also states tolerances. How much colour variation passes. What weight range the ceramic can fall within. Which defects fail inspection.

Then the first samples come back.

They are almost never right the first time. That is normal. The green is too blue. The glaze is too glossy. The proportions drifted somewhere between the drawing and the mould.

Each round of comments and corrections takes weeks. Kilns, moulds and couriers set the pace, not email pressure. Three months gives room for two or three rounds, and you will need them.

The discipline that saves this stage is fast, precise feedback. When a sample lands on my desk or in my e-mail as a picture, the factory gets comments within hours, with photos, measurements and the reference standard side by side. Slow feedback is the silent killer of sampling timelines. A factory waiting two weeks for comments is a month lost by the second round.

By the end of month 5, every item has an approved final sample. This becomes the golden sample, the contract standard every production unit must match. Testing has run in parallel. Food contact ceramics need migration tests. Candles need burn tests. Anything for children has its own set of standards. Then we are ready to go. Orders are placed, quantities fixed. From this point, changes cost real money.

After approval: production, shipping, shelf

The development sprint is done, but the products still have a journey ahead. Production for a supermarket range often means hundreds of thousands of units across many factories. Inspections happen during production and before the containers close. Then four to six weeks on the water from Asia to Europe, plus time through ports and distribution centres.

Nothing about this phase is glamorous. Everything about it is critical. A late vessel or a failed inspection has little buffer left to absorb it.

Then the products land in stores. Shoppers see a fresh seasonal range that feels current and coherent. They see none of the months behind it. That is the point. When the process works, it is invisible.

What this means for you

If you take one thing from this post, take this: seasonal retail runs on early decisions executed with precision. The retailers who win at seasonal are not the ones with the best last minute instincts. They are the ones with the best process months before launch.

Three practical lessons:

1. Decide early and hold the line. Late changes are the most expensive thing in this industry. I once watched a range lose its shipping window because one colour got debated for six extra weeks. The products arrived after the season peak and went straight to markdown. The colour discussion cost more than the colour ever could have earned.

2. Spend your effort on the specs. Every hour spent making a CMF spec precise saves weeks of sampling rounds later.

3. Trust the filter, not the forecast. Trend reports give you options. Your knowledge of your customer, your price points and your shelf gives you answers. The strongest range I ever built used only two directions from a forecast that offered nine. The buyers pushed back at first. The sell through numbers ended the discussion.

I help retailers, garden centres and suppliers turn trend forecasts into seasonal ranges that sell. If your team is planning for 2027 / 2028 and wants an experienced eye on the range, get in touch.