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Applied Quiz: Ecoregions and Growing Conditions

A second set of questions on this chapter, weighted toward using the ideas rather than recalling them. Each one puts you in a situation and asks what the chapter's framework says to do.

1. A garden center in Duluth sells you a perennial tagged "Hardy to Zone 4." Duluth sits in Zone 3b. What does the chapter's zone logic tell you?

  1. It will be fine — Zone 4 plants always survive Zone 3 winters
  2. The plant is rated for winters down to about -30°F, but Zone 3b can reach -35°F, so it may not survive your coldest years
  3. Zone numbers apply only to trees, not perennials
  4. The tag is wrong; zone ratings are not meaningful in Minnesota
Show Answer

The correct answer is B. Lower zone numbers mean colder winters, so a Zone 4 rating is a promise about a warmer place than Zone 3b. The plant may survive mild winters and then die in a hard one, which is the pattern that confuses gardeners most. Option A inverts the scale — the single most common misreading of the map.

Concept Tested: USDA Hardiness Zones

See: Chapter 2

2. You buy Big Bluestem seed from a supplier in Kansas because it is cheaper. Your garden is in the Twin Cities. What problem does this chapter predict?

  1. None — Big Bluestem is Big Bluestem wherever the seed comes from
  2. Kansas plants are tuned to a much longer growing season, so they may not flower and set seed before Minnesota's first frost
  3. Kansas seed will not germinate in Minnesota soil
  4. The plant will be invasive because it came from out of state
Show Answer

The correct answer is B. This is the local ecotype argument. A population adapted to a 200-day season carries a growth schedule that does not fit a 140-day one — it can spend the season growing and be caught by frost before reproducing. Option A ignores within-species adaptation, which is the whole point of the section. Option D confuses provenance with invasiveness.

Concept Tested: Local Ecotypes and Growing Season

See: Chapter 2

3. Two neighbors on the same street both have Zone 4b yards. One's Butterfly Milkweed thrives; the other's rots and dies. What does this chapter say is the most likely explanation?

  1. One of them bought a defective plant
  2. Hardiness zone only describes winter cold; Butterfly Milkweed needs dry, well-drained soil, and one yard probably has heavy or poorly drained ground
  3. Butterfly Milkweed is not hardy in Zone 4b
  4. The difference must be caused by different amounts of fertilizer
Show Answer

The correct answer is B. Bree's key insight in this chapter is exactly this: a plant can be zone-hardy and still fail because the soil, light or moisture is wrong. Butterfly Milkweed is a dry-soil, sandy-site species with a deep taproot that rots in wet clay. Zone is one variable among several, not a complete specification.

Concept Tested: Hardiness Zones vs. Site Conditions

See: Chapter 2

4. You want to know what plant community historically occupied your specific parcel in Eden Prairie. Which tool answers that question?

  1. The USDA Plant Hardiness Zone Map
  2. The Marschner pre-settlement vegetation map on the Minnesota Natural Resource Atlas, reconstructed from the 1850s Public Land Survey notes
  3. The USDA Web Soil Survey
  4. A University of Minnesota Extension soil test
Show Answer

The correct answer is B. The Marschner map is the parcel-level answer to "what grew here before 1850." Option C is a genuinely useful tool from the same chapter, but it tells you your soil, not your historic plant community — the chapter's point is that combining the two gives the strongest answer. Options A and D describe climate and chemistry, not history.

Concept Tested: Pre-settlement Vegetation

See: Chapter 2

5. A Web Soil Survey report for your yard names the unit "Cathro muck." What should that steer you toward?

  1. Dry prairie species like Pasque Flower and Prairie Dropseed
  2. Wet-tolerant species — muck is an organic, saturated soil, so think Blue Flag Iris, Joe Pye Weed, sedges and tamarack rather than dry-prairie plants
  3. Nothing in particular; soil unit names are for engineers
  4. Heavy amendment with sand before planting anything
Show Answer

The correct answer is B. "Muck" signals a wet organic soil, which is a habitat to plant into rather than a defect to fix. Option A names species the chapter explicitly assigns to sandy, well-drained ground. Option D repeats the re-engineer-the-site instinct this book keeps arguing against.

Concept Tested: Soil Types and Plant Selection

See: Chapter 2

6. Someone claims a bog and a fen are basically the same thing since both are peaty wetlands. Using this chapter, what distinguishes them and why does it matter for plants?

  1. Nothing meaningful — the words are interchangeable
  2. Bogs get water mainly from rain and are acidic and nutrient-poor; fens are groundwater-fed and less acidic, which is why fens support far more sedges, grasses and rare orchids
  3. Bogs are in the south of the state and fens in the north
  4. Fens are always forested and bogs never are
Show Answer

The correct answer is B. The water source drives the chemistry, and the chemistry drives which plants can live there. This distinction is why Showy Lady's Slipper turns up in calcareous fens and not in sphagnum bogs. Option D confuses these with swamps, which are the forested wetland type.

Concept Tested: Minnesota Wetland Types

See: Chapter 2

7. A farmer says Minnesota's western soils are rich "because the land was never forested." Using this chapter, how would you sharpen that?

  1. The claim is wrong — prairie soils are poor compared with forest soils
  2. Roughly right but incomplete: the richness came from thousands of years of deep prairie roots dying back and building organic matter, producing the dark Mollisols now farmed
  3. The soils are rich because glaciers deposited fertile bedrock there
  4. Soil fertility has nothing to do with the previous plant community
Show Answer

The correct answer is B. The chapter connects two of its own facts: prairie roots run 10 to 15 feet deep, and a square yard of prairie soil can hold over 20 miles of roots. Centuries of that turning over is what built the Mollisols. Absence of trees is a consequence of the fire and rainfall regime, not the mechanism that made the soil fertile.

Concept Tested: Prairie Soils and Root Systems

See: Chapter 2

8. You are told less than 2% of Minnesota's original tallgrass prairie remains. What does that figure imply for someone planning a prairie planting?

  1. Prairie planting is pointless because the ecosystem is already lost
  2. Remnants are rare and irreplaceable, so restored and garden prairies carry real conservation weight — and remnant sites should be protected rather than harvested from
  3. It means prairie plants are hard to buy
  4. It means the state should convert farmland back to prairie by law
Show Answer

The correct answer is B. Going from roughly 18 million acres to under 2% makes tallgrass prairie one of North America's most endangered ecosystems, which raises rather than lowers the value of restoration work. Option A draws exactly the wrong conclusion from scarcity.

Concept Tested: Tallgrass Prairie Loss

See: Chapter 2

9. Your yard is on the Anoka Sand Plain. A landscape designer proposes a lush moisture-loving planting with regular irrigation. What does the chapter suggest instead?

  1. Accept the plan — irrigation solves sandy soil
  2. Sandy Entisols drain fast and dry out quickly, so plant the dry prairie and oak savanna community that belongs there rather than fighting the site with water
  3. Truck in clay to hold moisture
  4. Plant nothing until the soil is rebuilt with compost
Show Answer

The correct answer is B. The chapter names the Anoka Sand Plain specifically as dry prairie and oak savanna ground. A permanently irrigated planting on fast-draining sand is a maintenance obligation forever, and it discards a genuinely distinctive Minnesota plant community.

Concept Tested: Sandy Soils and Site-Appropriate Planting

See: Chapter 2

10. A gardener near Moorhead and a gardener in Rochester both plant the same late-blooming aster. Whose plant is more at risk of being cut short, and why?

  1. Rochester, because southern Minnesota has hotter summers
  2. Moorhead, because northwestern Minnesota has a shorter frost-free season, so a late bloomer has less time to flower and set seed before the first fall frost
  3. Neither — frost dates are the same statewide
  4. Moorhead, because the hardiness zone there is warmer
Show Answer

The correct answer is B. The chapter gives roughly 90–110 frost-free days in the north against 150–170 in the far southeast. A species that blooms in late September has comfortable margin in Rochester and very little further northwest. Option D inverts the zone map.

Concept Tested: Growing Season Length

See: Chapter 2