SiteOne Landscape Supply, Inc.'s (NYSE:SITE) price-to-earnings (or "P/E") ratio of 41.7x might make it look like a strong sell right now compared to the market in the United States, where around half of the companies have P/E ratios below 16x and even P/E's below 9x are quite common. Although, it's not wise to just take the P/E at face value as there may be an explanation why it's so lofty.

SiteOne Landscape Supply has been struggling lately as its earnings have declined faster than most other companies. It might be that many expect the dismal earnings performance to recover substantially, which has kept the P/E from collapsing. If not, then existing shareholders may be very nervous about the viability of the share price.

See our latest analysis for SiteOne Landscape Supply

Does Growth Match The High P/E?

The only time you'd be truly comfortable seeing a P/E as steep as SiteOne Landscape Supply's is when the company's growth is on track to outshine the market decidedly.

Taking a look back first, the company's earnings per share growth last year wasn't something to get excited about as it posted a disappointing decline of 36%. However, a few very strong years before that means that it was still able to grow EPS by an impressive 46% in total over the last three years. So we can start by confirming that the company has generally done a very good job of growing earnings over that time, even though it had some hiccups along the way.

Turning to the outlook, the next three years should generate growth of 12% per annum as estimated by the nine analysts watching the company. Meanwhile, the rest of the market is forecast to expand by 13% each year, which is not materially different.

In light of this, it's curious that SiteOne Landscape Supply's P/E sits above the majority of other companies. It seems most investors are ignoring the fairly average growth expectations and are willing to pay up for exposure to the stock. These shareholders may be setting themselves up for disappointment if the P/E falls to levels more in line with the growth outlook.

What We Can Learn From SiteOne Landscape Supply's P/E?

It's argued the price-to-earnings ratio is an inferior measure of value within certain industries, but it can be a powerful business sentiment indicator.

Our examination of SiteOne Landscape Supply's analyst forecasts revealed that its market-matching earnings outlook isn't impacting its high P/E as much as we would have predicted. When we see an average earnings outlook with market-like growth, we suspect the share price is at risk of declining, sending the high P/E lower. This places shareholders' investments at risk and potential investors in danger of paying an unnecessary premium.

You should always think about risks. Case in point, we've spotted 1 warning sign for SiteOne Landscape Supply you should be aware of.

If P/E ratios interest you, you may wish to see this free collection of other companies with strong earnings growth and low P/E ratios.

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This article by Simply Wall St is general in nature. We provide commentary based on historical data and analyst forecasts only using an unbiased methodology and our articles are not intended to be financial advice. It does not constitute a recommendation to buy or sell any stock, and does not take account of your objectives, or your financial situation. We aim to bring you long-term focused analysis driven by fundamental data. Note that our analysis may not factor in the latest price-sensitive company announcements or qualitative material. Simply Wall St has no position in any stocks mentioned.