In the past, I started off growing sets indoors in containers, but these days I tend to used trays like in the picture below, as they are much more efficient for smaller spaces. Just remember to harden off your onion sets and get them used to the elements, by leaving them outside for an hour a day for a week or so before you permanently locate them outside. So it is important to keep conditions as constant as possible because onions are susceptible to weather changes.īy keeping your sets indoors until spring starts, you can avoid this problem.
This is a problem because in such a case, the bulb stops growing. When the bulb grows bigger, it can benefit from those long summer days in the UK (the few we’re lucky enough to get!).Īnother reason growing onion sets indoors can be a good idea is because if there is a cold snap in spring, the plants will see this as winter occurring and could bolt – that’s when they run to seed suddenly. The reason it’s good to plant your onion sets indoors, is because onions need to get as much growth in as early as they can because they are photothermoperiodic. This is a rather complicated word that means onions are sensitive to light and temperature and need to get enough hours of daylight at the right temperature for optimum growth, so bigger onions need to be planted early. So, for all of those looking to maximise self-reliance by growing their own food, but who don’t have a ton of space available, I highly recommend getting started with onion sets.
#Starting onion seeds in trays free#
But after going through the process for the first time, I realised that planting my onion sets on windowsills was a viable way to free up extra room in my backyard. When I first grew onion sets indoors, I was a bit worried they wouldn’t have enough access to light and that transplanting them to larger containers would be a problem, as I’d only transplanted seedlings outdoors before. After hardening off, you can transplant them to bigger pots and move them outside a few weeks later when spring starts.It’s best to plant your sets around February and it won’t be long before you see the green shoots start sprouting.
You can start out planting onion sets indoors using trays or small containers filled with multi-purpose compost. Onions sets were among my top choices, given their ease of growth from sets instead of seeds and suitability for container gardening. Being a resident of a flat in a metropolitan area, my aim was to maximise both space and time. Initially, my focus was on planting low-maintenance and space-efficient vegetables when I began growing my own food.
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