Houseplant Propagation: Germinating Seeds Of Houseplants

By Heather Rhoades

Houseplant propagation is a good way to grow more of your favorite plants. In addition to cuttings and division, growing houseplant seeds is also possible. Contrary to what many people believe, you don’t have to have your own greenhouse to accomplish this (though it doesn’t hurt either). A sunny spare room or even a kitchen window sill is ideal. Let’s learn more about how to propagate houseplants by seed.

Seed Propagating Houseplants

If you plan on starting plants from seed, you have to have a place to put the seed trays where they can be kept warm and at a fairly constant temperature. Good light is important too. So is keeping them away from drafts. The pots you plant the seedlings in are going to take up a lot of room, so make sure you have the space to do this as well.


Use small trays or seed pans for small quantities of plants and standard seed trays for larger quantities. These trays should be washed clean. You’ll want to keep each container to itself for the seeds of only one species of plants. All plants grow at different rates, and this makes it easier to keep track if each tray holds only one kind of plant. Use waterproof ink to labeling each tray.

You should check the compost in the trays each day without disturbing the seedlings in any way.  Water from below when it’s necessary. Don’t keep it wet, but instead constantly moist. Keep the trays at an even temperature. This is what is best for the new little seedlings.

For anything that germinates best in the dark, you can be keep them inside a cupboard. You can also put folded newspaper over the glass lid until the seedlings start to grow. Once they start to grow, give the seedlings good light, but not strong sunlight or they’ll burn. You should also remove the glass lid or bag from the ventilators of the pan so fresh air can enter. Once the seedlings are big enough to handle, you can carefully pick them out for transplanting.

How to Propagate Houseplants by Seed

Seed propagating houseplants isn’t hard but there are steps to growing houseplant seeds. They are simple enough to follow, that’s for sure. Let’s take a look at these guidelines for germinating seeds of houseplants:

  • First, lay out some peat or peat substitute in the tray. If you are using clay trays or pans, soak them first so they don’t absorb the moisture out of the compost. Top the peat with seed compost or soilless seed mix. Seed compost is light, sterile and contains all the nutrients baby plants need to thrive. Press the compost firmly into the pan/tray.
  • You will want to add more compost to fill the tray completely. Smooth and level the compost, firming the compost down. Once it’s firmed, the compost should come to about 2 cm below the edge of the tray.
  • Fold a piece of paper in half and pour the seeds into the “V” of the paper. This way you can spread the seeds evenly over the compost. Don’t sprinkle the seeds too close to the edges because the compost will dry faster there and stay moister in the center. Make sure to label and date the tray so you know what is growing and when to expect germination.
  • The seeds will germinate best if you cover them with a thin layer of compost. If you sift the compost through a sieve, you can sprinkle a thin layer of compost over the seeds. Only the finest of sprinkling is needed for small seeds.
  • You should water the compost by setting the tray in a dish filled with water so that the water comes halfway up the sides of the tray. You can leave the tray in the water until you see water appearing on the surface. Take the tray out of the water and allow all excess water to drain away from the tray. Leave the cover on the tray until you see the seedlings.
  • If you don’t use a propagator, you can slide the seed tray into a plastic bag and tie it loosely. You can also cover the tray with a sheet of glass. Just make sure neither touches the compost. Anything that germinates in the dark should be covered with newspaper. Remove the plastic or glass each day and wipe away any condensation.
  • Once you see that the seedlings are big enough to handle, move them into another tray. This tray should be prepared as the first one was. Place the seedlings onto a piece of wet newspaper until you have the tray prepared.
  • Once the tray is prepared, you can use a pencil or similar object to make the holes for the seedlings to go into. Cover them so only their seed “leaves” and above are showing. You should water them from below and let the tray drain well. Keep the tray in bright light, but not strong, hot sunshine. True leaves will come along as the seedlings mature. Take the plants, once they have several sets of leaves, and transplant each seedling into its own separate pot.

Now you will have plenty of new plants to enrich your indoor garden. In addition to houseplant propagation, you can do vegetables this way or even flowers. Anything you want to grow you can start from scratch.

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