Growing container red onions from seedlings [Container Gardening ]

Growing container red onions from seedlings is a rewarding project that doesn’t require much space. Here’s a step-by-step guide:

Choose the Right Container: Use a large, deep pot (at least 6–8 inches deep) with drainage holes. Onions need room for their roots to spread, so ensure it’s spacious enough.

Prepare the Soil: Fill the container with loose, well-draining soil mixed with organic compost. Onions thrive in nutrient-rich soil with a slightly acidic to neutral pH (6–7).

Plant the Seedlings: Gently place the seedlings into the soil, ensuring each one is spaced about 3–4 inches apart. Plant them so the roots are fully covered but the bulb remains exposed.

Sunlight: Place the container in a location that gets at least 6 hours of direct sunlight daily. Onions love full sun!

Watering: Keep the soil consistently moist but not waterlogged. Check frequently to ensure the soil doesn’t dry out, especially in warmer weather.

Feeding: Use a balanced liquid fertilizer every few weeks to support growth. Avoid over-fertilizing, as it can lead to weak bulbs.

Monitoring Growth: As the seedlings mature, you may notice the tops starting to yellow and fall over—this is a sign the onions are ready to harvest. It usually takes 90–120 days, depending on the variety.

Harvesting: Once the tops have wilted, carefully dig out the onions, brush off the soil, and let them cure in a dry, airy space for a week or two before storage.

Growing onions in containers is perfect for small spaces, like patios or balconies, and ensures fresh, flavorful produce at your fingertips
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If you’ve been following this channel for any length of time, you’ll know that every single year we like to try something different. And I picked up something this morning and I thought we’ll have a go at it. They should be grown in a greenhouse, but this particular variety is quite cold tolerant. And I’ll show you what the plant is very shortly. But first, I’m going to pop outside cuz I’ve got a couple of jobs to do. It’s another very warm day. So, I decided we’re going to spend most of today out and about in this container garden and get a few more things planted. I’ve just done some more multi-sewn onions. that these are red onions. So, we’ve got quite a few in there. We’re going to see if we can grow those together in a bunch just like the ones behind. I’ve also set up a few more containers of potatoes. I just need to top them off a bit later. I have still got some of these multi-sewn red onions left. So, what I’m going to do is I’m going to pop them into these very small containers and grow them as individual red onions and see how they get on. Before I plant these onions, I’m going to give it a really good watering. Let it soak down. I don’t want to be washing these onions out. So, that’s why I’m doing it first. And that’ll be plenty. Just going to take some of these out. You can see they’ve already got a really good root system. So, I’ll just separate them off. You can see bulbs already trying to form. Really easy to separate these onions. Just going to pop them to one side. And again, really good roots. They basically separate themselves, but they are coming along really well. So, we’ll get them in. And I’m just going to put them away from edge. I want to give these onions a chance to swell. So, don’t put them right up to the edge of your containers. I’m making a deep hole so I can feed that root in with this pen. I’m just going to push it in so it’s just below surface covering that white up. And then we’ll firm it down. And this compost hasn’t been compressed down either. I like to leave it loose for onions so they’ve got space for growth. So, same thing again. Poke those roots in, stand it up, and just lightly firm it down. Pretty easy job to do. As always, they don’t want much or anything at the moment anyway. Usually, I’ll give them a twist as well. You’ve probably seen me do that before. It helps those roots to go in a bit easier. Just making sure I get all that root in there. They’re going to sag a little first off, but they’ll soon pick back up. And then I’m just going to put one in center. I don’t want to overcrowd these onions. I want to try and get them to an decent size. So, that’s the last one going in there. And we’ll just pop that to one side and let these onions pick back up. So, exact same thing again. Really easy to separate. And then exact same thing that we just did. nice deep holes away from that edge. And then with a little twist, those roots all fall into place. And it’s virtually stood itself up as well. So, we’ll crack on and get another job finished today. And once again, that’s the last one. And that’s two containers of red onions set up. And as you’re pottering around your garden, keep an eye on your cabbages. And if you see yellowing leaves, take those away. They’re no good at all. And they’re just going to attract slugs. So just go around and break them away and keep the bottoms of all your plants nice and clean. And since we’ve seen a couple cabbage whites lately, I might have to think about putting a net over top of these because I don’t want them ruining at this stage. So, now we’ve got all those onions planted. We’ll cross his fingers and hope we get some good results. And the reason that I’m planting seed grown onions rather than red onion sets is because for some reason I never seem to have too much luck when I try and grow red onions from sets. They just never seem to want to bulb up. So, I thought we’d try that seed method. And this is his new plant to add to this container garden. It’s a melon plant. And as you’ve just seen, they’re called sweetheart. So, they’re quite a small melon, but apparently they’re not that difficult to grow. We’ll find out. And as I was saying earlier, normally you would put that in a greenhouse and just let it vine everywhere, but we’re going to plant that in a container outside and hopefully we’ll get some melons this year as well. But for the moment, I’m going to leave it in this container and let it grow on a little bit. I don’t like to put them outside when they’re quite small seedlings just in case that weather turns. So, I’ll keep it in that pot, pop it in that propagator with his cucumber plant, and then at some point, we’ll get both of those, put into big containers, and then we’ll provide them with a bit of framework to allow them to climb up. So, we’ve got a couple more jobs done today. We’ve got four more containers of Charlotte second early potatoes. So, we’ve got lots of onions in that container garden now. Hopefully, we’ll get some red onions this year. We’ve got plenty on go. So fingers crossed for that as well. Ever closer to May. And we’ve now got a week of temperatures that range from 20 up to 23 this coming Thursday. So be ready for that. And apart from making sure that your plants have got plenty of water. Also make sure you put some sun cream on. You can burn quite easily and we don’t want to be getting sunburn. So that’s why I’ve got my hat. So if you want to see what’s going to be happening through May, then please hit that subscribe button and press that notifications bell. I’ll see you on the next one. Take care.