Horticulture Trivia Questions
- ❓ 81+ questions
- 🗂️ Agriculture
- 🎚️ Easy to expert
- ✨ Free to play
Art of garden cultivation. Play Horticulture trivia solo to sharpen your knowledge, or challenge a friend head-to-head in Trivia Tango — every question comes with an explanation so you learn as you play. Questions span every level, from easy warm-ups to expert-level stumpers, so there's a real challenge here however much you already know.
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Sample Horticulture Quiz Questions
A mix of easy, medium and hard — questions run from warm-up to expert, so there's a real challenge at every level. Think you know the answers? Play to find out.
This number-based system, developed by the USDA, helps gardeners determine which plants can survive winters in their geographic location.
Difficulty: Easy- Heat zone map
- Hardiness zone
- Sunset climate zone
- Köppen classification
These small holes in leaves, primarily on the undersides, allow plants to exchange gases and release water vapor during transpiration.
Difficulty: Medium- Chloroplasts
- Nodes
- Lenticels
- Stomata
This phenomenon describes the inverse relationship between stomatal conductance and atmospheric CO2 concentration observed across geological time and during experimental CO2 enrichment.
Difficulty: Hard- CO2 fertilization effect
- Stomatal acclimation
- Stomatal density response
- Photosynthetic downregulation
Removing spent flower heads before seeds form encourages plants to produce more blooms throughout the growing season.
Difficulty: Easy- Pinching
- Deadheading
- Disbudding
- Topping
This plant growth regulator, produced in shoot tips, promotes cell elongation and causes phototropism by migrating to the shaded side of stems.
Difficulty: Medium- Cytokinin
- Auxin
- Gibberellin
- Ethylene
This quantum yield measurement indicates the maximum efficiency of photosystem II, calculated from variable fluorescence divided by maximum fluorescence in dark-adapted leaves.
Difficulty: Hard- Electron transport rate
- Non-photochemical quenching
- Photosynthetic capacity
- Fv/Fm ratio
This soil type, ideal for most garden plants, combines sand, silt, and clay in relatively balanced proportions with good drainage.
Difficulty: Easy- Loam
- Sandy soil
- Clay soil
- Chalky soil
This pathogenic water mold thrives in wet conditions and causes rapid root and crown rot in many ornamentals, identifiable by sudden wilting despite moist soil.
Difficulty: Medium- Phytophthora
- Pythium
- Rhizoctonia
- Fusarium
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