It’s finally time to transplant my little herb seedlings!!! We planted seeds six weeks ago, and they’ve being doing great so far.
Before we get started I want to share some useful info I’ve discovered throughout this process.
When should I transplant my seedlings?
Transplanting your seedlings can be really hard on your plants, so you need to make sure that they are strong enough to withstand the shock. There are a couple of different guidelines for when your seedlings are ready to be transplanted. A lot of people say you should transplant 5 to 6 weeks after planting, but I think there are some better indicators than simply how long the plants have been growing.
You definitely should not transplant your seedlings until they have grown their “true leaves”. The first set of leaves that sprout out of the ground are called cotyledons and they are actually part of the seed. They are basically a source of food for the plants and contain the nutrients the seedling needs to grow. The next set of leaves that sprout can look very different (look at the close ups of the dill, some leaves are long and skinny and some are frond-y, very different!) and they are the plants’ true leaves. Up until this point the plants don’t actually need sunlight; they aren’t photosynthesizing because all of their nutrients come from the cotyledons. So at the very least, wait until your plants have their first set of true leaves before transplanting!
|Top: True leaves on our basil seedlings, Bottom: Roots growing every which way!|
But don’t wait too long either! If you started your seeds in a small pot they will have a fair bit of room to grow. We started ours in seed starting pellets which are a lot smaller, so I didn’t want to wait too long before transplanting or the roots would have run out of room to grow. In the top picture above you can see the first true leaves of our basil seedlings. And in the other two pictures you can see that the roots of the basil and the catnip have grown all the way out of the bottom of the pellet!
How do I transplant my seedlings?
So if your seedlings are ready to be transplanted let’s get started! You’ll need:
- your seedlings
- pots (I painted the ones in the picture above and added little chalkboard paint labels, you can check out the tutorial here)
- a trowel
- a few rocks
- potting soil
- a container to mix the soil in
A quick note: Perlite is basically volcanic glass and it’s available at most hardware stores or anywhere you would buy potting soil. The perlite is not 100% necessary, but it’s highly recommended. Because of some sort of complicated, science-y thing, perlite helps prevent soil compaction. If the soil is compacted it will have difficulty absorbing water and the plants’ roots can have trouble growing through the tightly pressed soil. So, not necessary but you probably should use it anyway.
First you’ll want to mix 3 parts potting soil and 1 part perlite in a container with your trowel. Make sure it’s mixed well!
|The little white specks are perlite granules|
Then add a few of the rocks to the bottom of your pot. This will help the pot drain better and stop the soil from leaking out of the hole at the bottom.
Fill the pot with the potting soil mixture, but make sure to leave some room at the top. Tamp down the soil a bit; you don’t want it loose and fluffy, but you don’t want it totally caked down and solid. You want enough room on top of the soil to set the seedling there and have the base of the stem come up to just below the top of the pot. Alternatively you can fill the pot all the way up and then dig a hole to place the seedlings in, but I think this way is easier.
At this point you have to prep your seedlings for transfer. If you grew them in a smaller pot you want to place your hand on top of the soil, seedling between your fingers for support, and turn the pot over. Shake it a bit to get the plant to fall out. Very gently break the root ball apart with your fingers right at the very bottom; leave the rest intact! Then place the seedling on top of the soil.
If you grew your seedlings in little pellets like I did you’ll need to remove the “skin” around the soil of the plant. You can make a slit with a knife or scissors and then pull the rest of it apart.
If your seedlings have a fairly solid root ball (meaning the soil at the base of the seedling is very well held together by the plants’ roots) you can break it up a bit (very gently!) right at the very bottom. Then place the seedling on top of the soil.
One important thing to think about when you transplant your seedlings is how big of a pot they will need. The general consensus is that you should have one plant per pot for pots 8″ or smaller. If you’re using 10″ or larger pots you might be able to get away with multiple plants per pot.
I decided to ignore this and put two seedlings in our pots for two reasons. First, I am a little bit worried that the seedlings might not survive the shock of the transplant and this way I get two chances. Second, we are not too worried about these plants being “stunted”; if they are a little smaller than they possibly could be that is okay with us. And worst case, if there truly isn’t room for two plants to grow properly in one pot we can always thin one later. This just gives us more options.
Once you have your seedlings in the pot, fill the rest of the space with soil and tamp it down gently again. You want the soil to just reach the base of the seedling’s stem. Don’t pile the soil up too far on the stem; you don’t want the leaves of the plant to get wet if water pools up when you water it.
Now the plants need a bit of water. Water them gently; don’t get the leaves of the plant wet, and make sure the water isn’t so forceful that it leaves divots in the top of the soil. Tiny tiny holes are ok, that’s just the soil settling in after its first watering, but you don’t want holes the size of a dime or larger, that’s bad. Water until some water just starts to drain out of the drainage hole at the bottom.
And you’re done! Don’t forget to put your plants back in the windowsill so they continue to get sun.
The spearmint and rosemary aren’t quite ready to be transplanted; they just sprouted about two weeks ago so they’re still pretty fragile and tiny. But I got four of the herbs transplanted this weekend! We don’t actually have room in our windowsill for six pots (only three will fit across on the sill) so we hacked together a shelf real quick so we can have two layers of plants.
Do you have any plants growing right now? Are they in pots or outdoors?
This post is part of a series about growing herbs indoors. You can see the rest of the posts in the series here.
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