DRAWING THE SHEET —
CULTIVATION / NURSERY — PROPAGATION & HARDENING OFF
Where the next crop roots, then toughens up to leave.
An unrooted cutting loses water faster than it can replace it. This house holds soft, humid air over young tissue, then opens by degrees to harden the starts off.
- SOFT AIR FOR ROOTING
- OPEN BY DEGREES TO HARDEN OFF
- BUILT TO HOST ROLLING BENCHES
01 — THE ENEMY — THE LOST FLAT
Young tissue gets one bad afternoon, ever.
THE PROPAGATION BAND
0.4–0.8 kPa
LOW VPD, NEAR 75–80% HUMIDITY — YOUNG TISSUE TRANSPIRES SLOWLY WHILE ROOTS FORM. VPD, EXPLAINED
An hour of dry, moving air wilts a whole flat. The environment here decides between a saleable flat and a compost pile.
02 — THE MECHANISM
One house runs the gentle climate and the hardening one.
Still, humid air for rooting, because moving air wilts a cutting.
A tight, sealable envelope holds the gentle climate. Build it in the build tool.
Open the house by degrees to harden starts off.
The active-ventilation package stages the fans up as starts toughen, and automated roof shading ($8,000 in the book) softens the light until they can take it. See roof shading.
A structure built to host the bench plan.
Clear 30-ft bays and 14-ft sidewalls leave room for rolling benches, and bench vendors put the recovered area at 20–30% (their number). Benches come from bench suppliers; see equipment beyond the greenhouse.
Cool Lock white steel on a PE-stamped frame.
About 69% less solar heat over trays of tender seedlings (NASA Publication 1121), with county-sized wind and snow ratings picked on The Series.
SHADING ON, ACTIVE VENTILATION READY TO STAGE.
03 — PROPAGATION MORNING
The order that ships Friday is already standing here.
The mist just cycled off, and the bench in front of you is a green sheet of cuttings that all took. Two bays down, last month's liners are getting their afternoon of harder light and moving air, learning to be field plants.
04 — THE OBJECTION LEDGER
The four questions every propagator asks.
“What does a propagation house cost?”
$40,000 for a 30×60 bay in the book, and worked builds run about $51,050 to $364,250, computed live at the build tool. The quote covers the building; benches and misting come from specialist suppliers.
“Do I need full climate control for propagation?”
High-value or disease-sensitive propagation earns tight control, and hardy stock does fine on the active-ventilation package. The one question: active vs. VPD.
“Will rolling benches really fit more crop?”
They recover the aisle, and bench vendors cite 20–30% more usable area. The top can double as your ebb-and-flow surface. Benches come from bench suppliers; we design the house they roll in.
“Can my crew build it?”
Yes: 22 kinds of parts, one kind of bolt, four people, 10–14 days, no crane. Steel ships 7 days after the order.
05 — THE FIT FILTER
Who this house fits.
IT’S FOR YOU IF
You propagate for a living: cuttings, plugs, liners, starts. Young roots want a gentle climate, and hardening off asks you to steer it week by week.
IT’S NOT FOR YOU IF
You only need a season-extension hoop for a few flats. We're overbuilt for that, and we'll say so on the first call.
06 — QUESTIONS, ANSWERED
What propagators ask before they call.
What climate does propagation need?
A low vapor-pressure deficit, roughly 0.4 to 0.8 kPa at around 75–80% humidity, so unrooted cuttings transpire slowly while roots form. As the starts toughen, you raise light and air movement to harden them off.
Can one house do both propagation and hardening off?
Yes, when the envelope is controllable: held soft and humid for young tissue, then opened by degrees, ideally across separate bays.
Do rolling benches really pay for themselves?
They recover the fixed aisles, and bench vendors put that at roughly 20–30% more usable growing area. The bench top can double as an ebb-and-flow surface. Benches come from bench suppliers; we design the house that hosts them, with clear 30-ft bays and 14-ft sidewalls.
How much does a nursery greenhouse cost?
The frame starts at $40,000 in the book, and worked builds run from about $51,050 to $364,250 by size and covering. The quote covers the building; benches and misting come from specialist suppliers. Price the structure at /build.
MORE OF THESE AT THE ANSWER DESK.
Price the house the next crop starts in.
The preset build opens with shading on and active ventilation ready to stage. Sixty seconds prices your exact structure from the book.
BOOK PRICES, NO EMAIL GATE — EDIT AS YOU GO.