Miniature greenhouses are not all one size. What is miniature to a home owner with a yard is large to an apartment dweller with a terrace. A miniature greenhouse can be built to fit the needs of both, creating an opportunity for everyone to give their plants a head start on the growing season.
Soda Bottle Method
Cut both plastic bottles at the point where they begin to taper off at the top. Take the colored plastic base off of one of the bottles.
Fill the other bottle about 1/4 of the way up with a mix of the soil and sand at a ratio of about 2 parts soil to 1 part sand.
Place from five to 10 seeds in the soil following the directions on the seed packet.
Turn the bottle without the base upside down and place it over the one with the seeds so that the two overlap each other and the top bottle reaches almost to the soil line.
Transplant the seedlings to flower pots after they are 2 to 3 inches tall.
Plant outdoors when danger of frost is past, or grow in containers on a deck or patio.
Build a rectangular bed with 2-by-4-inch pieces of lumber to the size you want the greenhouse to be. Fill the box with the type of soil recommended for your plants.
Pound pieces of the rebar into the ground to a depth of about 34 inches--leaving about 20 inches above ground--at each of the four corners and at the middle part of the frame at each side. Do this on the inside of the frame. This is the support for the copper tubing hoops.
Measure the size of the copper loops by inserting one end of the tubing over one of the rebar stakes and looping it over the top of the planting box so it is the height you want it to be. Cut it off at the soil level. Put that end over the rebar stake opposite the first one. Make two more pieces of copper tubbing the same length and install them over the remaining rebar in the same manner.
Drape the plastic over the frame, making sure a few inches overhang at ground level on all four sides. Hold down the plastic by placing rocks on the extra plastic. Another option would be to place a 2-by-4 over the extra plastic on each side and use the rocks just at the front and rear.
Roll up one side of the plastic when you water or check on the plants.
About this Author
Regina Sass has been a writer for 10 years, penning articles for publications in the real estate and retail industries. Her online experience includes writing, advertising and editing for an educational website. Sass is a member of the Society of Professional Journalists.