Florida Nursery Grower Certification
Exam Questions with Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. A container nursery experiences widespread chlorosis in a block of
ornamental shrubs despite a regular fertilization program. Soil tests indicate
adequate nitrogen levels but a pH of 7.8. What is the MOST likely cause of the
chlorosis?
A. Nitrogen toxicity
B. Iron deficiency induced by high pH
C. Root pruning injury
D. Excess irrigation
Answer: B. Iron deficiency induced by high pH
Rationale: High soil pH reduces iron availability, often causing interveinal chlorosis
even when nutrients are present in the soil.
2. A nursery manager discovers that root systems of recently transplanted
container-grown trees are circling within the root ball. What is the MOST
significant long-term concern?
A. Increased flowering
B. Girdling roots causing structural instability
C. Enhanced nutrient uptake
D. Improved drought tolerance
Answer: B. Girdling roots causing structural instability
Rationale: Circling roots can eventually constrict trunk growth and reduce tree
stability and longevity.
3. Which irrigation method generally provides the highest water-use efficiency
in container nursery production?
,A. Overhead impact sprinklers
B. Traveling gun irrigation
C. Drip irrigation
D. Flood irrigation
Answer: C. Drip irrigation
Rationale: Drip systems deliver water directly to the root zone with minimal
evaporation and runoff.
4. A nursery receives a shipment of liners showing symptoms consistent with a
regulated plant pathogen. What should occur FIRST?
A. Plant the liners and monitor them
B. Isolate the shipment and initiate reporting procedures
C. Apply fungicide immediately
D. Blend them with existing inventory
Answer: B. Isolate the shipment and initiate reporting procedures
Rationale: Suspected regulated pathogens require quarantine and proper
notification before distribution.
5. Which factor MOST influences the availability of micronutrients in nursery
substrates?
A. Pot color
B. Substrate pH
C. Container shape
D. Irrigation pressure
Answer: B. Substrate pH
Rationale: Micronutrient availability is strongly affected by pH, particularly iron,
manganese, and zinc.
6. A grower notices wilting during the afternoon, but plants recover overnight.
What is the MOST likely explanation?
A. Permanent root failure
B. Temporary water stress exceeding root uptake capacity
, C. Viral disease
D. Fertilizer toxicity
Answer: B. Temporary water stress exceeding root uptake capacity
Rationale: Midday wilting often results when transpiration exceeds water
absorption.
7. Which propagation method produces offspring genetically identical to the
parent plant?
A. Sexual reproduction by seed
B. Open pollination
C. Vegetative propagation
D. Cross-pollination
Answer: C. Vegetative propagation
Rationale: Cuttings, grafting, and tissue culture produce clones of the parent
plant.
8. A nursery block develops severe root rot following extended rainfall. Which
environmental factor MOST likely contributed?
A. Excess oxygen in the root zone
B. Poor drainage and saturated conditions
C. Low humidity
D. Reduced substrate moisture
Answer: B. Poor drainage and saturated conditions
Rationale: Waterlogged conditions favor root rot pathogens and reduce root
oxygen.
9. What is the PRIMARY purpose of scouting in nursery production?
A. Increase fertilizer use
B. Detect problems before economic damage occurs
C. Eliminate all pests immediately
D. Replace recordkeeping
Answer: B. Detect problems before economic damage occurs
Exam Questions with Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. A container nursery experiences widespread chlorosis in a block of
ornamental shrubs despite a regular fertilization program. Soil tests indicate
adequate nitrogen levels but a pH of 7.8. What is the MOST likely cause of the
chlorosis?
A. Nitrogen toxicity
B. Iron deficiency induced by high pH
C. Root pruning injury
D. Excess irrigation
Answer: B. Iron deficiency induced by high pH
Rationale: High soil pH reduces iron availability, often causing interveinal chlorosis
even when nutrients are present in the soil.
2. A nursery manager discovers that root systems of recently transplanted
container-grown trees are circling within the root ball. What is the MOST
significant long-term concern?
A. Increased flowering
B. Girdling roots causing structural instability
C. Enhanced nutrient uptake
D. Improved drought tolerance
Answer: B. Girdling roots causing structural instability
Rationale: Circling roots can eventually constrict trunk growth and reduce tree
stability and longevity.
3. Which irrigation method generally provides the highest water-use efficiency
in container nursery production?
,A. Overhead impact sprinklers
B. Traveling gun irrigation
C. Drip irrigation
D. Flood irrigation
Answer: C. Drip irrigation
Rationale: Drip systems deliver water directly to the root zone with minimal
evaporation and runoff.
4. A nursery receives a shipment of liners showing symptoms consistent with a
regulated plant pathogen. What should occur FIRST?
A. Plant the liners and monitor them
B. Isolate the shipment and initiate reporting procedures
C. Apply fungicide immediately
D. Blend them with existing inventory
Answer: B. Isolate the shipment and initiate reporting procedures
Rationale: Suspected regulated pathogens require quarantine and proper
notification before distribution.
5. Which factor MOST influences the availability of micronutrients in nursery
substrates?
A. Pot color
B. Substrate pH
C. Container shape
D. Irrigation pressure
Answer: B. Substrate pH
Rationale: Micronutrient availability is strongly affected by pH, particularly iron,
manganese, and zinc.
6. A grower notices wilting during the afternoon, but plants recover overnight.
What is the MOST likely explanation?
A. Permanent root failure
B. Temporary water stress exceeding root uptake capacity
, C. Viral disease
D. Fertilizer toxicity
Answer: B. Temporary water stress exceeding root uptake capacity
Rationale: Midday wilting often results when transpiration exceeds water
absorption.
7. Which propagation method produces offspring genetically identical to the
parent plant?
A. Sexual reproduction by seed
B. Open pollination
C. Vegetative propagation
D. Cross-pollination
Answer: C. Vegetative propagation
Rationale: Cuttings, grafting, and tissue culture produce clones of the parent
plant.
8. A nursery block develops severe root rot following extended rainfall. Which
environmental factor MOST likely contributed?
A. Excess oxygen in the root zone
B. Poor drainage and saturated conditions
C. Low humidity
D. Reduced substrate moisture
Answer: B. Poor drainage and saturated conditions
Rationale: Waterlogged conditions favor root rot pathogens and reduce root
oxygen.
9. What is the PRIMARY purpose of scouting in nursery production?
A. Increase fertilizer use
B. Detect problems before economic damage occurs
C. Eliminate all pests immediately
D. Replace recordkeeping
Answer: B. Detect problems before economic damage occurs
