How to Convert an IKEA Cabinet into a Greenhouse Cabinet - and Why You Should. This is for people with limited growspace or windowsill growers who need extra humidity in winter. Or anyone who wants more grow space for their plants. This talk will cover the hows and whys as well as the tools necessary to convert the cabinet. We will also cover pitfalls and troubleshooting methods. Cabinets can be highly personalized, and there are as many options as there are people who grow.