Rethinking Plant Categorization: The Rise of Tropicals

Rethinking Plant Categorization: How Houseplants and Tropicals Found Their Place

For decades, the horticulture industry has excelled at tracking and classifying bedding plants, annuals, and perennials that dominate garden centers each spring. Yet, despite their cultural and economic importance, foliage and tropical plants have historically fallen through the cracks when it comes to accurate sales data and categorization. The rise of tropical houseplants as a mainstream category is a relatively recent phenomenon and understanding how we got here helps explain both the challenges and opportunities the industry faces today.

A Late Arrival: Houseplants Enter the Data Conversation

For much of the 20th century, industry statistics focused heavily on outdoor annuals like petunias and impatiens, or perennials like hostas and daylilies. For many years their sales numbers have been well quantified, tied directly to seasonal garden sales. Foliage, by contrast, was a niche market, popular among interior landscapers and specialty retailers but largely untracked by national reporting systems.

It wasn’t until the late 1970s that tropical houseplants began to gain real visibility in mainstream retail. The expansion of big-box stores such as Kmart, Sears, and later Home Depot and Walmart changed everything. These mass merchants began dedicating shelf space to indoor greenery, offering consumers an entirely new way to experience plants. Suddenly, houseplants were no longer limited to florist shops or local greenhouses—they were available everywhere, often at prices accessible to the average household.

This retail revolution helped create a nationwide appetite for indoor foliage, but industry data collection never fully caught up. Even today, tracking systems like USDA crop reports or market analyses often lump foliage into broad “nursery” categories, masking the real scale of the indoor tropical and foliage market.

The Problem with “Annuals” and “Perennials”

Part of the confusion stems from the very language we use to classify plants. The terms annual and perennial have long served as shorthand for consumer behavior; plants you replant every year versus those that return season after season. But these definitions are not universal. A plant that behaves as an annual in Minnesota might be perennial in Florida. Hibiscus, Mandevilla, and Bougainvillea, for instance, thrive outdoors year-round in the South yet are treated as summer color or patio plants farther north.

This geographic fluidity makes the traditional annual/perennial divide increasingly inadequate in a globalized, climate-aware marketplace. Many growers, distributors, and retailers now see the need for clearer, trackable categories that better reflect both usage and growing conditions.

Toward a More Accurate Classification System

A logical next step would be to formally separate indoor tropicals from outdoor tropicals—two groups that currently share overlapping but distinct markets.

• Indoor tropicals (foliage/houseplants) would include the wide range of species suited to interior environments: philodendrons, pothos, calatheas, ficus, and countless others.
• Outdoor tropicals would include heat-loving, sun-hungry species such as Hibiscus, Mandevilla, and Bougainvillea—plants that deliver seasonal color in temperate zones but behave as perennials in tropical climates.

Such a framework would allow more accurate reporting, benchmarking, and forecasting across the supply chain. For growers and distributors, it would clarify production cycles and marketing strategies; for retailers, it would help align assortments with consumer expectations.

New Generations, New Growth

While classification challenges remain, demand for tropicals, foliage, houseplants, to be determined… has exploded in recent years, driven in large part by millennial and Gen Z consumers. Social media platforms such as Instagram and TikTok have turned plant ownership into a lifestyle, celebrating “plant parenthood” as a form of self-expression and wellness. This cultural shift has transformed foliage from a background décor element into a personal statement piece.

Then came COVID-19. During the pandemic lockdowns, millions of people confined to their homes turned to plants for comfort, beauty, and connection to nature. Nurseries and foliage suppliers saw unprecedented spikes in demand, with some categories doubling or tripling in sales almost overnight. What began as a coping mechanism evolved into a lasting trend, as consumers discovered the joy and challenge of nurturing living décor.

Looking Ahead

As the industry continues to evolve, it’s time for a renewed conversation about how plants are categorized and tracked. Accurate, standardized reporting for indoor and outdoor tropicals would not only clarify market performance but also help growers and retailers plan more efficiently.

The world of plants has always been fluid—growing, adapting, crossing borders and climates. Our data systems need to do the same. By modernizing how we define and measure these categories, the horticultural industry can better reflect the vibrant diversity of today’s plant marketplace—and ensure that the next generation of “plant parents” keeps the green momentum growing.