Egg Education

eggshell planters seedlings

Easy Eggshell Planters

Seed starting indoors is a great way to bring spring a little early to your classroom. Use these eggshell planters in your school garden or have your students bring them home once the warm weather arrives!

What you need:

Eggshell planter

  • 1 dozen eggs
  • egg carton
  • bowl
  • potting soil
  • knife
  • spoon
  • permanent marker
  • seeds (either on kind or a variety of seed types)  
Step 1 – Hollow out the eggshells

Using the knife, carefully crack each egg at the pointed end of the shell. This can be done by gently hitting the shell with the sharper end of the knife to ‘chisel off’ a ‘cap’.

Then, place the egg contents into a bowl so that you can use them in cooking for later!  Give the eggshells a little rinse before placing them back in the egg carton.


eggshell planter 

Step 2 – Add the soil

Next, use the carton to hold your empty shells and begin filling with potting soil. Do this over your bowl to limit mess. (Tip: if you crush the tops of the shells in a blender to a fine powder, you can incorporate that into the soil for added nutrients.)

Tip: Make sure to read the potting depth on your individual seed packages! Different seeds will need different depths. For example, for the shells that would hold our pumpkin seeds, we made sure to leave a well of about 1.5cm, whereas our mint seeds needed only a few millimetres of depth.

Eggshell planter with soil 

Step 3 – Add the seeds and label the shells

Now it’s time to drop in a few seeds into each eggshell planter. Again, it’s important to read the spacing requirements on the packets of your seeds. Some eggshells might allow for 1 seed (like in the case of a large pumpkin seed) others will hold several (like carrots) and some will hold even more (like our tiny mint seeds)!

So that you know which seeds are which, make sure you label the eggshell planter with your permanent marker as you go!

eggshell planter with seeds 

Step 4 – Top off with more soil

Now it’s time to cover up the seeds the rest of the way with your potting mix.

eggshell planter closeup

Step 5 – Water, sunshine and waiting

Finally, the last thing that your seedlings need in order to germinate is plenty of water and sunshine. Add water to each shell. You can do this by holding them under a running tap (make sure the tap is just barely trickling so that you have full control over the amount of water added!). In fact, you can use a little watering can if you’ve got one or even create your own DIY version – a water bottle with a small hole poked in the lid works great.

The wonderful thing about eggshell planters is that they tend to fit well on most windowsills! This is where we’ve placed ours. Make sure to continue watering every day or two to ensure that the seeds are getting the moisture they need in order to sprout.

eggshell planter moist soil 

You’ll be seeing some sprouts soon! Transplanting tips are below.

eggshell planter sprouting

Are you watching your seedlings grow? Depending on how many varieties of seeds you’ve planted, you may see them sprout at different rates. Some will make an appearance in as little as a few days, others may take a week. Once you see that the seedlings are well into the sprouting process and have established a good root system (in most cases a week or two), they can be planted outside, weather permitting. Before placing them into your outdoor garden, carefully break the eggs and remove the bottom part of the shell, then place them directly into the ground. Do this step out in your garden so you don’t have to worry about any mess.

Tip: Are you doing this eggshell planter activity in the spring? Make sure it’s warm enough outside for your sprouts to survive! They won’t do well with frost. If you suspect chilly weather is on the horizon, you may have to transplant them into a larger pot until they’re ready for the garden.

eggshell planter seedlings

Happy eggshell planter gardening, class!

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