As many gardeners already know, there are a myriad of cold frame and mini greenhouse designs available online. Recently, our co-author (John L. Dose) wrote a piece on a similar topic, DIY Greenhouse and Cold Frame. My spin on this theme will examine my recent experience with a decent mini-greenhouse purchased on-line from Quictent.
The overall design of this structure is pretty good, however, a few improvements are in order. Once the panels are zippered shut, there is no possibility of cross ventilation. In the early spring, in Zone 6, this can prove fatal to young seedlings. The enclosed structure does an excellent job of staying warm but can get pretty hot on a 50 – 60 F degree day with good sunlight. If the grower isn’t close by to vent the front panels, he or she runs the risk of damaging young seedlings. To remedy this I’m going to insert two side vents. The other concern deals with securing the structure to the ground. Tent spikes are not provided to achieve this end. Thus, a trip to a local vendor needs to be done before setting sail (literally).
Overall, I do recommend this particular growing structure as it goes up easy and is easily packed away between uses. It also serves to harden off seedlings when transitioning plants from the greenhouse to the field. In a manner of speaking, the mini-greenhouse (MG) design serves a similar function as a cold frame. Next season, 2023, we plan to build 3 cold frames (CF) and perhaps place the MG on top of a raised bed. this will allow us to evaluate which system does the best job.