Onions from Sets (started in cell trays) – How To Tell when Your Onions are Ready for Harvest

It’s the first year I’ve grown Onions from sets which were started in cell trays and the onions are looking very successful. I’m growing ‘Hercules F1’ white skin onions.

I planted them in cell trays back in March – How to Start Growing Onions in wet weather in cell trays with Planting Video

I’ve also used a mixed planting method to grow my carrots and parsnips in between the onions because carrot and parsnip pests don’t like the smell of onions. It’s all growing well together.

Onions planted in Raised Beds

Things I’ve Learnt About Growing Onions

  1. Onions swell up so much that they literally sit on the soil when they fatten up.
  2. I’m glad I got the spacing right when I put the sets in the ground. The onions did grow very large this year due to the rain we have had through the spring and summer.
  3. Starting Onions in cell trays (instead of in the wet ground) was a great solution that paid off as the onions are all very healthy plants – How to Plant Onion Sets in the Ground that have been grown in Cell Trays

How Do You know when Onions are Ready for Harvest?

The leaves fold over (bend) at the stem by the top of the bulb.

This process usually happens in early to mid August, if you started your onions in cell trays in March.

Onions in this bed have all laid flat and leaves have bent (as per red circle) at bulb. They are ready to harvest.
TOP – Onion (blue circle) NOT ready as stem is straight and upright. BOTTOM – Onion ⭕ IS ready to harvest as Stem is bent over at bulb.


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