From 6 to 24 Plants: How Display Size Controls Customer Behavior

The Paradox of Choice: Is Less Always Better?

You might be familiar with the famous "jam study," which suggested that offering fewer choices leads to more sales. However, in the world of horticulture, the brain works differently.

Imagine walking through a garden center and spotting two tables of identical houseplants (a "single-genus" display). Table A is overflowing with twenty-four plants, while Table B is nearly empty with only six. At a regular price, you are far more likely to choose from the full table. Research by Li et al. (2025) using eye-tracking technology with participant surveys indicates that at a regular price, purchase intention increases as the display size and complexity grow. Participants in the study immediately associated the fuller table with a higher standard of quality.

However, this dynamic shifts completely the moment a discount sign appears. In that case, the size of the display stops mattering to the brain; the likelihood to buy remains stable whether there are six or twenty-four plants on the table.

The Split-attention Effect

When we shop, our brains must integrate information from different sources, such as the visual arrangement of the products and the text on a price sign. According to the Cognitive Load Theory, a "split-attention effect" occurs when visual elements are difficult to process at the same time, requiring extra mental effort. The study reveals that a large display paired with a regular price is actually easier for our brains to process because it aligns with our expectations of quality. The regular price creates a need for quality justification, which the large display visually provides. In contrast, when a discount is offered, the economic incentive becomes so dominant that the quality is less important and therefore the need for choice (multiple items on display) does not longer influence their decision.

The Price-Quality Shortcut

The way we look at price signs tells a fascinating story about our unconscious hesitation. Eye-tracking data showed that for regular-priced items, consumers tend to stare at the pricing sign longer. This happens because the mental shortcut of 'high price equals high quality' is less automatic when the prices are not extremely high or extremely low, forcing the brain to actively search for justification of the cost. This increased focus on the price sign is negatively related to purchase intention; the longer a customer contemplates about the price, the less likely they are to buy. While for discounts, the assumption of lower quality may be satisfactory - thereby the display does not need a lot of options to choose from. 

Optimizing Your Reach

The best strategy combines these scientific insights with practical execution on the shop floor:

• Focus on "Facings": Unlike the jam study (which dealt with different varieties), this is about the mass of the same product. More plants of the same type on one table increase the perception of quality at a regular price.
• For Regular-Priced Items: Displays of 12 to 24 plants perform significantly better than tiny groupings of six. This showcases your expertise and provides the visual confirmation customers subconsciously crave.
• For Discounts: Think compact. You can achieve the same sales volume using less square footage, allowing you to reserve primary floor space for your higher-margin inventory.

The Take-home Message

The eye is drawn to what the brain can immediately resolve. By aligning the complexity of your display with your pricing strategy, you lower the mental effort for your customers and make the shopping experience smoother and more efficient.