Actually, it’s not an upside down planter, but it has a plant upside down in the bottom. I’m not sure wehre I first saw this but it was way before the infomercials about the commercial models came out.
This works best for larger plants and is mostly seen growing tomatoes. Tomatoes have a hard time holding the weight of the fruit up and often split the stems. This is one way to avoid that, as the fruit hangs down and theres not sharp angles to break off the stalks. Another plant that this will work with are bell peppers. Use your imagination and see what else you can do with it. Other plants will readily grow in it.
Simply put you cut a hole in a hanging planter. You use a piece of plastic mesh, screen, sewing/yarn sheet of plastic stuff with all the squares, or the bonsai filter plates that go in the bottom of bonsai pots. You can also just use a small hole. I drilled a large hole because I had a cordless drill handy with a big hole saw. You can put smaller plants in smaller holes, or bigger ones in bigger holes.
You will next need a piece of plastic (or wood would work too) with a slot in it to slide the plant upside down, onto. Carefully place the upside down plant and the retainer into the bottom of the hanging basket. It helps to hang it up somewhere while you do the rest of this.
There is room for a couple plants but personal preference is the rule. Here I have put a 6 to 8 inch bell pepper start from a hydroponic groblock in the bottom. You can also use starts from dirt. Again, it depends on how you want to grow them I use hydroponic because they grow very fast after germination.
Place dirt up to about halfway filling the hanging pot. Leave enough room so that you can put the top plants in and cover them. It makes planted the secondary plants a little easier if you dont have all the dirt in.
Make an indentation in the soil for each plant you plan to have in the top. I am putting three mini bell peppers on the top so I dug out three impressions to place the seedlings. These are much smaller than the larger plant that I put in the bottom.
After you place and firm the seedlings in the top finish filling the top up with soil. It is usually safe to add it almost even with the top as it will settle when it is watered.
You must also remember that when watering you have put a hole in the bottom. Thusly and therefore it will leak water from the bottom. This isn’t a problem if they are outside.
If you are starting them early inside make sure you have a drip pan underneath them unless you are very careful about watering quantities, or don’t care about the floor. Starting them early inside makes it much easier to move them outside and back in if need be when cold weather comes unexpectedly.
This is a great way to save space in limited areas like apartments and windowsills. A sunny corner in a warm room can often work as well. Even if there is space, especially with heavy tomatoes, it can still be useful.