Greenhouse cooling Fan and Pad system –Large wet cellulose pad at one end of house –Fan at other end to draw air through pad –Cover pad during winter –Treat.

Greenhouse cooling• Fan and Pad system

– Large wet cellulose pad at one end of house– Fan at other end to draw air through pad– Cover pad during winter– Treat recirculating water with chemical

• Whitewash or Shade Cloth• Ventilation

– Reduces temperature– Supplies CO2

Climate Control Systems

Fan and Pad Cooling

Gas Heaters

Greenhouse bench design and placement

• Stationary raised benches (most common)

• Rolling

• Double-tiered– Hanging baskets or for rolling outside

• Ebb and flood floor (post-propagation)

• Ground Bed– Hold flats or fill with substrate

Other Propagation Structures• Hot frames

– Smaller, low structures on the ground – Covered with poly, heated in winter– Same purpose as propagation house

Other Propagation Structures• Cold frames

– Similar to hot frame in size– Covered with poly or lath, not heated (sun

only)– Used to condition or harden rooted cuttings or

young seedlings before transplanting– Maintain high humidity initially to transition – Also used to start material late spring when no

heat needed

Other Propagation Structures• Lathhouses

– Covered with shade cloth, lath, snow fencing is inexpensive option

– Provide shade, reduce temperatures – Used for hardening off, acclimation