Four Star Greenhouse
Four Star Greenhouse is a wholesale producer of Proven Winners branded young plants and finished crops, serving commercial growers, garden retailers, and landscapers across North America. Founded in 1977 in Carleton, Michigan, it leverages proprietary genetics, multi-location trialing, and a 14+ broker distribution network.
- Company typePrivate
- Founded1977
- HeadquartersCarleton, United States
- Headcount251–500
- GTM typeB2B
- OfferingHardware or Manufacturing
What Four Star Greenhouse does
Four Star Greenhouse is a wholesale producer of Proven Winners branded young plants (liners) and finished crops, headquartered in Carleton, Michigan. Founded in 1977 by Tom and Sharon Smith as Smith's Greenhouse and rebranded after becoming a founding member of the Proven Winners brand in 1992, the company serves commercial greenhouse growers, retail garden centers, and professional landscapers across North America. Its core product lines include vegetatively propagated annuals (Supertunia, Superbells, ColorBlaze, Superbena, Angelface, Luscious, Sweet Caroline, Graceful Grasses), Heart to Heart caladiums, ColorChoice flowering shrubs, Proven Accents, and perennials, supported by a proprietary Supernova liner programming protocol, virus-free laboratory propagation, and a multi-location trialing network spanning Michigan, New Hampshire, Germany, Japan, and Florida.
The business operates 26+ acres of indoor greenhouse plus 4+ acres of outdoor production at its Carleton, MI campus and distributes through 14+ authorized brokers (Ball Seed, Griffin, McHutchison, Harris Seeds, BFG Supply, among others) and a regional sales team organized by territory. Revenue is generated primarily through unit-pricing on liners and finished crops, with a tiered Key Account Rewards Program (Bronze/Silver/Gold at 20K/50K/100K+ liners annually) creating volume-based incentives, plus ecosystem revenue from required branded containers, PW Professional Fertilizer formulations, AquaPots self-watering planters, and bundled combination kits. Downstream consumer reach flows through retail garden centers and major retailers including Home Depot, Lowe's, and Amazon via the company's grower customers.
In October 2025, Four Star consolidated with sister company Pleasant View Gardens (Loudon, NH) into a single Proven Winners entity under new ownership in partnership with private equity firm Staple Street Capital (~$900M AUM), with the Smith and Huntington founding families remaining active owners. The unified company will operate under a single price list and product offering beginning with the 2027 selling season, with stated intent to expand into underserved North American markets.
Four Star Greenhouse firmographics
Firmographics- Name
- Four Star Greenhouse
- Legal name
- Four Star Greenhouse
- Website
- https://pwfourstar.com
- Company type
- Private
- Founded year
- 1977
- Operating status
- Operating
- Headcount range
- 251–500 employees
- Short description
- Four Star Greenhouse is a wholesale producer of Proven Winners branded young plants and finished crops, serving commercial growers, garden retailers, and landscapers across North America. Founded in 1977 in Carleton, Michigan, it leverages proprietary genetics, multi-location trialing, and a 14+ broker distribution network.
- Ownership category
- akta.pro rank
Four Star Greenhouse industry classification
Industry- Product category
- Ornamental Horticulture / Wholesale Plant Production
- NAICS
- Greenhouse, Nursery, and Floriculture Production (1114), Nursery and Floriculture Production (11142), Floriculture Production (111422), Nursery and Tree Production (111421), Nursery, Garden Center, and Farm Supply Retailers (444240)
- SIC
- Agricultural Production-Crops (100), Agricultural Services (700)
- akta.pro primary industry
- Potted Flowering Plants & Bedding Plants Production (Annuals, Perennials, Plugs) (AFAGAHAE)
- akta.pro secondary industries
- Nursery Stock & Propagule Production (Cuttings, Rootstocks, Grafts) (AFAGAIAO), Landscape Plant & Nursery Stock Wholesalers (Grower-Wholesalers) (AFAGAHAM), Plant Breeding & Variety Development (Conventional) (AFAGAIAF), Other Specialty & Industrial Crop Farming (Emerging/Regional Specialty Crops) (AFAGAGAO)
Keywords
Where Four Star Greenhouse is headquartered
LocationHeadquarters
- HQ city
- Carleton
- HQ country
- United States
- HQ region
- North America
Offices2 records
Markets served
Four Star Greenhouse business model
Business model- GTM type
- B2B
- Offering type
- Hardware or Manufacturing
- Cost components
- Personnel, Operations, Supply Chain, Infrastructure, Technology or R&D, Marketing or Sales
Revenue model
- Plant Sales - Liners and Finished Crops: Wholesale sale of Proven Winners branded plant liners (young plants) and finished crops to commercial growers. Products include annuals, perennials, shrubs, and caladiums sold in various tray sizes (104 Liners, Supernova 52, Supernova 28, etc.).
- Key Account Program: Tiered loyalty program for large growers (20,000+ liners annually) offering reduced pricing, lower shipping rates, and redeemable reward points for co-op advertising, fertilizers, and promotional materials.
- Bundled Combination Kits: Pre-packaged combination growing kits containing multiple plant varieties with recipe-specific container garden tags. Offered in standard, premium (4 varieties), and lite formats for streamlined combination production.
- Branded Containers and Tags: Sale of proprietary branded containers (Eco+ Grande, Eco+ Quart, 4.25 Grande, etc.) and identification tags required for single pot production under Proven Winners brand.
- Professional Fertilizers: Proprietary water-soluble fertilizer formulations (14-3-14, 16-4-16, 18-5-18, 17-4-17) with 100% FeEDDHA chelated iron, matched to customer water alkalinity levels.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Unit Pricing | Annual | Bronze Key Account: 20,000-49,999 liners annually |
| Unit Pricing | Annual | Silver Key Account: 50,000-99,999 liners annually |
| Unit Pricing | Annual | Gold Key Account: 100,000+ liners annually |
Go-to-market motion3 records
Distribution channels16 records
Marketing channels7 records
Four Star Greenhouse product offering
Product offeringCore offering
Four Star Greenhouse produces and wholesales Proven Winners-branded young plants (liners) and finished ornamental crops to commercial growers, retail garden centers, and professional landscapers across North America. The product portfolio spans annuals (Supertunias, Superbells, ColorBlaze, Superbena, Angelface, Luscious, Sweet Caroline, Graceful Grasses), Heart to Heart caladiums, ColorChoice flowering shrubs, Proven Accents accent plants, and perennials, complemented by Supernova programmed liners, PW Professional Fertilizers, branded containers, AquaPots self-watering planters, and bundled combination kits.
Product overview
Four Star Greenhouse operates as a wholesale plant grower and supplier of Proven Winners® plants, now unified under a single company structure following consolidation in October 2025. The core offering consists of vegetatively propagated annuals (Supertunias®, Superbells®, ColorBlaze®, Superbena®, Angelface®, Luscious®, Sweet Caroline, Graceful Grasses®), tropical Heart to Heart® Caladiums, ColorChoice® flowering shrubs, Proven Accents® accent plants, and perennials. The product ecosystem is supported by specialized liner programs (Supernova® Liners in 52, 50, and 28 sizes), bundled combination kits for container recipes, PW Professional Fertilizers in 8 alkalinity-matched formulations, branded containers including Eco+ compostable options, AquaPots® self-watering planters, and the Key Account Rewards program. Additional support services include the Culture Guide, Vigor Index, Complete Package Program, National Plants of the Year promotional program, and online ordering via epicas.pwfourstar.com.
Differentiator
Problem solved
Functional benefit
Brands
- Supertunias: Self-cleaning, floriferous petunias - the company's flagship product line with over 1,400 awards won in trials.
- Superbells
- ColorChoice Shrubs
- Heart to Heart Caladiums
- Proven Accents
- National Recipes
Products and services
- Supernova® Liners Specially programmed young plant liners (Supernova 52, Supernova 50, and Supernova 28 sizes) designed to reduce finishing times to 4-5 weeks versus 7-10 weeks for standard liners, with intensive lighting, pinching, PGRs, and heat treatments producing more uniform flowering and stronger branching. Sold to commercial wholesale growers.
- Supertunias® Petunias Self-cleaning, floriferous petunia series including Supertunia Vista (vigorous, up to 2 feet mounding, 3 feet trailing), standard Supertunia, and Supertunia Mini Vista (compact, dense branching). Won 1,407 trial awards across industry trial gardens. Sold as young plants to wholesale growers.
- Superbells® Calibrachoa Award-winning calibrachoa (902 trial awards) with mounded trailing habits. Includes varieties Double Redstone, Yellow IV, Pink II, Dreamsicle II, and Tropical Sunrise. Sold as young plants to wholesale growers.
- ColorBlaze® Coleus Award-winning foliage coleus series (815 trial awards) with colorful leaf patterns. Includes varieties Mini Me Watermelon, El Brighto, and Royale Cherry Brandy. Sold as young plants to wholesale growers.
- Superbena® Verbena Award-winning verbena series (313 trial awards) with vigorous mounded trailing habits. Includes Violet Ice, Red, Pink Shades, and Whiteout varieties. Sold as young plants to wholesale growers.
- Sweet Caroline Ipomoea Ornamental sweet potato vine series (498 trial awards) with various foliage colors and patterns. Includes Medusa, Sweetheart, Raven, and Bewitched varieties. Sold as young plants to wholesale growers.
- Angelface® Angelonia Award-winning angelonia series (286 trial awards) with vertical flower spikes. Includes Angelface Blue III and Perfectly Pink varieties. Sold as young plants to wholesale growers.
- Luscious® Lantana Award-winning lantana series (399 trial awards) with heat and drought tolerance. Includes Luscious Citrus Blend II and other color varieties. Sold as young plants to wholesale growers.
- Graceful Grasses® Ornamental Grasses Ornamental grasses series (293 trial awards) including King Tut and Blue Mohawk varieties for texture and vertical interest. Sold as young plants to wholesale growers.
- Heart to Heart® Caladiums Tropical caladium series with heart-shaped leaves in various color patterns. Available in shade types (Caribbean Coral, Dawn to Dusk) and sun/shade types (Chinook, Mesmerized, White Wonder) for versatile growing. Sold as young plants to wholesale growers.
- ColorChoice® Flowering Shrubs Premium flowering shrubs bred for superior garden performance. Includes hydrangeas (Incrediball, Let's Dance, Bobo, Fire Light), clematis, spiraea (Double Play series), weigela, lilacs (Bloomerang series), and roses (Oso Easy, Reminiscent). Sold as young plants and one/two/three gallon container plants to wholesale growers.
- Proven Accents® Accent Plants Accent plants selected for colorful foliage and interesting forms, adding texture to planters and beds. Includes Silver Falls dichondra, Pegasus begonia, Plum Dandy alternanthera, Icicles helichrysum, and ivy varieties. Sold as young plants to wholesale growers.
- Proven Winners Perennials Perennial plants including Athena Gold heliopsis, Pink Chablis and Purple Chablis lamium, Cat's Meow and Cat's Pajamas nepeta, Mega Millions rudbeckia, and additional varieties from Walters Gardens, Inc. Sold to wholesale growers via the Walters Gardens partnership.
- Bundled Combination Kits Pre-packaged combination growing kits containing multiple plant varieties with recipe-specific container garden tags. Offered in standard, premium (4 varieties), and lite formats for streamlined combination production. Popular combos include Above & Beyond, Grand Traverse, Polar Peach, and Main Street USA.
- PW Professional Fertilizers Proprietary water-soluble fertilizer formulations (14-3-14, 16-4-16, 18-5-18, 17-4-17) with 100% FeEDDHA chelated iron for improved iron uptake, matched to customer water alkalinity levels. Includes specialty cold weather and pH correction formulas.
- Proven Winners Branded Containers Signature white branded containers required for single pot production under the Proven Winners brand. Includes 3.5 Accents Co-Ex, 4.25 Grande Co-Ex, Eco+ Grande (industrial compostable), 4.5 Classic, 1.0 QT Co-Ex, Eco+ Elite, 6.5, and 1.0 GL Royale, plus ColorChoice 1/2/3 gallon containers for shrubs.
- AquaPots® Self-Watering Planters Self-watering ceramic and resin planters with a built-in reservoir that uses 75% less water than drip irrigation, eliminates fertilizer leaching, and provides consistent moisture to plants. Includes Original Ceramic, AquaPots Lite (urban/resin), AquaPots Lite Legacy (stone-composite), and AquaPots Insert for converting existing containers. Distributed exclusively by BFG Supply Co. in North America.
- 30-Second Planter™ Entry-level container gardening system designed for quick planting; allows growers to split bundled kit combinations between hanging baskets and 30-Second Planters with simple instructions printed on the branded container.
- 2026 New Varieties Collection 2026 new variety introductions across annuals, ColorChoice shrubs, Heart to Heart Caladiums, and perennials lines — released as the company's annual new product offering for the 2026 selling season.
- Superbells Magic® Double Grapefruit Double-flowered calibrachoa with rose-like blossoms that shift from lemon yellow to soft pink under UV sunlight, introduced in 2026 with a slightly looser habit for hanging basket mixes.
Quantifiable outcome
- Plants of the Year Program can increase sales on select varieties by up to 57%
- +1 more outcomes
Companies that use Four Star Greenhouse
Customer profileNamed customers3 records
Segments3 records
Ideal customer profiles3 records
Four Star Greenhouse technology and API
TechnologyTechnology focussed No
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Feature4 records
Four Star Greenhouse partnerships and signals
Strategic signalPartnerships
Ten partnerships are on record, tiered flagship, core and minor.
- Huntington and Smith Family FoundersflagshipFounding family owners (The Huntington and Smith families) remain active owners and leaders in the consolidated Proven Winners company following private equity partnership.
- Kientzler (Germany)coreHistorical partnership established in late 1980s with Germany's Kientzler for New Guinea Impatiens breeding. Tom Smith's work with Kientzler and travels throughout Europe led to the creation of Proven Winners brand in the United States in 1992.
- Spring Meadow (ColorChoice Shrubs)coreSpring Meadow's shrub line added to Proven Winners partnership in 2004, forming ColorChoice flowering shrubs brand offering.
- Walters Gardens, Inc.corePerennials added to Proven Winners partnership in 2011 through collaboration with Walters Gardens, Inc. Customers order perennials by contacting Walters Gardens at 888-925-8377.
- The Plant Company (leafjoy Houseplants)minorLeafjoy houseplants added to Proven Winners brand portfolio in 2022 through partnership with The Plant Company.
- BFG Supply Co.coreBFG Supply Co. is the exclusive North American distributor for AquaPots self-watering containers.
- Ball SeedcoreAuthorized broker for Four Star/Proven Winners plants. Phone: 800-879-2255, [email protected]
- GriffincoreAuthorized broker for Four Star/Proven Winners plants. Phone: 800-888-0054
- McHutchisoncoreAuthorized broker for Four Star/Proven Winners plants. Phone: 800-943-2230
- Harris SeedscoreAuthorized broker for Four Star/Proven Winners plants. Phone: 800-544-7938
Scale indicators6 records
Recent moves7 records
Expansion highlights6 records
Four Star Greenhouse competitors and assessment
Company assessmentBroad incumbents
- Costa Farms: Largest U.S. ornamental grower (#1 houseplants and #3 annuals), supplying Home Depot, Lowe's, and Walmart nationwide. Comparable ornamental production scale and retail relationships, but with a broader product portfolio (houseplants, annuals, perennials).
Direct peers
- PanAmerican Seed: Ball Horticultural's seed-based ornamental division (Wave petunias, etc.), supplying growers with branded seed and liner alternatives. Competes directly with Proven Winners® for branded plant programs in the same grower accounts.
- Sakata Ornamentals: Global vegetative and seed ornamentals breeder competing across pansy, sunflower, and zinnia categories. Comparable genetics and trial-development model for wholesale ornamental liner supply to growers.
- Walters Gardens: Perennial liner supplier for the Proven Winners® brand since 2011. Direct partner in perennial product line, also selling to wholesale growers and competing for perennial bench space.
- Syngenta Flowers: Global vegetative and seed ornamentals breeder (Syngenta) supplying liners, unrooted cuttings, and seed to growers worldwide. Competes head-to-head with Proven Winners® genetics across petunias, calibrachoa, and other annual categories.
- Spring Meadow Nursery: Proven Winners ColorChoice® flowering shrubs partner since 2004. Direct strategic partner for shrub genetics, sharing the Proven Winners brand while also supplying competing shrub lines to growers.
- Selecta One: European-based vegetative annuals breeder and producer specializing in poinsettias, calibrachoa, and cyclamen. Comparable peer in branded vegetative liner production and IP-bred genetics sold through broker networks.
- Dümmen Orange: Global leader in vegetative ornamentals breeding and liner production, offering a competing branded genetics portfolio (e.g., Calorey, Confetti, Suntastic). Direct competitor for greenhouse bench space at the same grower customers Four Star serves in North America.
- Pleasant View Gardens: Proven Winners partner grower in Loudon, NH, producing annuals, perennials, and Proven Winners® liners. Sister company now consolidated with Four Star under Staple Street Capital (2025), making it the most operationally comparable peer.
- Ball Seed Company (Ball Horticultural): One of Four Star's 14+ authorized brokers (800-879-2255) and a major North American wholesale distributor of seed and plant genetics. Operates overlapping broker/distribution model for growers and serves as both a channel and indirect competitor.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat6 records
Key risks7 records
Key highlights7 records
Customer concentration
Four Star Greenhouse social profiles
Digital presenceFour Star Greenhouse financial estimates
Financial estimateRevenue estimate
Valuation estimate
Four Star Greenhouse leadership team
Management profileNumber of profiles
Profiles24 records
Four Star Greenhouse funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Four Star Greenhouse M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Four Star Greenhouse
What does Four Star Greenhouse do?
Four Star Greenhouse produces and wholesales Proven Winners-branded young plants (liners) and finished ornamental crops to commercial growers, retail garden centers, and professional landscapers across North America. The product portfolio spans annuals (Supertunias, Superbells, ColorBlaze, Superbena, Angelface, Luscious, Sweet Caroline, Graceful Grasses), Heart to Heart caladiums, ColorChoice flowering shrubs, Proven Accents accent plants, and perennials, complemented by Supernova programmed liners, PW Professional Fertilizers, branded containers, AquaPots self-watering planters, and bundled combination kits.
Is Four Star Greenhouse a public or private company?
Four Star Greenhouse is a private company. It is classified as private equity controlled and is currently operating.
When was Four Star Greenhouse founded?
Four Star Greenhouse was founded in 1977. It employs 251 to 500 people.
Where is Four Star Greenhouse based?
Four Star Greenhouse is headquartered in Carleton, United States, in the North America region.
How does Four Star Greenhouse make money?
Five revenue lines are on record. Plant Sales - Liners and Finished Crops are the primary driver. The others are key Account Program, bundled Combination Kits, branded Containers and Tags and professional Fertilizers.
Who are Four Star Greenhouse's main competitors?
Costa Farms is listed as a broad incumbent. Direct peers are PanAmerican Seed, Sakata Ornamentals, Walters Gardens, Syngenta Flowers, Spring Meadow Nursery, Selecta One, Dümmen Orange, Pleasant View Gardens and Ball Seed Company (Ball Horticultural).
Does Four Star Greenhouse have an API?
No public API is recorded for Four Star Greenhouse.
What industry is Four Star Greenhouse in?
Four Star Greenhouse's product category is Ornamental Horticulture / Wholesale Plant Production. Its primary akta.pro industry code is AFAGAHAE, Potted Flowering Plants & Bedding Plants Production (Annuals, Perennials, Plugs), with a secondary code of AFAGAIAO, Nursery Stock & Propagule Production (Cuttings, Rootstocks, Grafts). Its NAICS code is 1114 and its SIC code is 100.