Seed Starting in Plastic Cup Greenhouses

One little seed starting trick I have in my bag of gardening tricks is to start seeds in plastic cup greenhouses!  I shared a picture of this about 2 weeks ago on the Facebook page and I thought today I would share with you the progress of the seedlings.

This is a very easy way to start some seedlings.  Just find two plastic cups (a Solo style plastic cup), one of which must be clear to allow light through. The plastic cups will cost you less than $3 or could even be free if you collect them after a family gathering or party.  If you are re-purposing the cups make sure they are clean.  

Fill the bottom cup with a seed starting mix and water.  Put your seeds in the cup and cover the seeds with an appropriate depth of soil then add a little bit more water.  Don’t add to much water – we don’t want the seeds to rot.  Cover with a clear cup and tape the sides.

plastic cup greenhouses - mini-greenhouses - seed starting
growing tomato seeds in plastic cups
Tomato Seedlings

Once seedlings have sprouted you can take the tops off.  When you do take the top off be sure to monitor the moisture daily. Drying out at this stage is very bad for the seedlings. Likewise don’t add too much water as you can drown the seedlings which is just as bad.

When the seedlings have grown their first set of true leaves you can transplant the plants to individual pots.  You can grow a lot of seedlings in a very small space with this method.  Make sure there is a light source around for the plants to use once they are germinated.  Some plants need light to germinate so for them don’t cover them with soil or if you do do so lightly!

growing seeds in plastic cups
Tomato seedlings in plastic cups

The plastic cups are like terrariums that keep the moisture inside for the seeds to use.

The cups contain the moisture and act like small greenhouses.
Check out those seedlings!

You can reuse the plastic cups over and over again to start lots of seeds just make sure you clean them between uses to prevent disease contamination from different batches of seedlings.  

Seed starting doesn’t have to use fancy equipment, just think outside of the propagation box!  These plastic cup greenhouses are my favorite method of seed starting. What containers have you used for seed starting?

Here’s How I Start My Seeds In Plastic Cup Greenhouses

If you watch the seed starting video you will notice that I am using colored plastic cups for the bottom and only using the clear cups for the lids.

4 thoughts on “Seed Starting in Plastic Cup Greenhouses”

  1. Hello Dave! thanks for the idea! I´m making a small greenhouse at home and Iam starting some seedlings,we are finishing our summer here,I hope I can have some vegetables for the winter. besos. Lilián.-

  2. I have been using recycled spinach and lettuce containers as well as plastic clamshells that have worked great. I should have used this method before.
    Thanks for sharing your success!

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