This Large Propagator With Height Extender Set Will Provide The Perfect Environment Which Optimizes Conditions For Germination And Growth And Protection Of Young Seedlings.the Vented Lid And Height Extension Allow For Control Of Humidity During Germination And When Closed Can Preserve Moisture And Heat Improving Results. The Clear Lid And Sides Will Not Reduce The Effectiveness Of Grow Lights Nor Degrade Under Uv Light.the Lid And Height Extension Can Be Used Outdoors For Direct Sown Seeds During The Early And Late Season Protecting The Seeds And Young Seedlings From Cold Or Inclement Weather.it Is Easy To Add Height Extensions To Permit Plants To Mature Both Indoor Or Outdoors In A Sheltered Environment. The Height Extenders Are Easy To Assemble And Disassemble Using The Thumb Nut And Screws Provided For Compact Storage When Not In Use. a Heated Pvc Mat Is Also Available That Can Increase The Temperature Of The Rooting Area Across The Mat Approx. 15c Higher Than The Ambient Temperature. Promoting Seed Germination And Plant Growth In Cold Environments.large Propagator With Height Extendersshatter Proof Lid And Sides Are Uv Stabilised And Crystal Clear To Allow For Maximum Light From Either Sunlight Or Grow Lights For Optimal Plant Growthadjustable Ventilation Control For Air Flow And Humidity To Give Your Plants The Best Environment sow Seeds And Cuttings Organically With Compost Directly Into The Base Or Use Smaller Traysmade In The Uk From Robust And Durable Injection Moulded Plasticmeasures 58cm X 38cm X 32cm Providing Space To Grow Lots Of Plantsmade To Last For Many Years With Carelarge Heated Pvc Germination Mat Measures 55cm X 35cm With A 1.5m Cable And 240v Plug