Chit and Cut Seed Potatoes for a 2-Week Head Start
I planted seed potatoes straight into the ground last May. Cold, wet Redmond soil, maybe 48 degrees if I was being optimistic. Six weeks later I had three sad sprouts and a lot of faith I probably didn’t deserve. Turns out I skipped a step that would have made the whole thing way less dramatic.
Chitting seed potatoes before planting is one of those things that sounds fancier than it is. You’re just waking them up on a windowsill instead of in the ground, where the soil doesn’t care about your timeline.
Greensprouting: The Two-Week Nap You Should Have Started Already
Set your seed potatoes somewhere bright and cool. Around 50-60 degrees. A north-facing windowsill works great, and an egg carton is perfect for keeping them upright with the eyes facing up. That’s it. Two to three weeks of this and you’ll have short, stubby green sprouts an inch or so long.
Those sprouts aren’t just decoration. The potato is converting stored starches and signaling auxin production through the apical eye, which biases the whole tuber toward vigorous upward growth. One sentence of science, I promise. Point is: you’re planting something that already knows what it wants to do.
In PNW terms, if you’re planting in May, you probably should have started chitting in mid-April. If you’re reading this now going “uh oh” like I have done multiple times, you still have options. Even ten days on the windowsill is better than zero.
Cutting Larger Potatoes: Not Complicated, But There’s One Rule
Bigger seed potatoes can be cut into chunks, which is honestly how I stretch my budget when seed potatoes aren’t cheap. Each piece needs at least two eyes. One eye is technically enough but two gives you a backup, and I’ve learned not to bet on the one-eye situation.
Use a clean knife. This is the part I got lazy about once and then lost three pieces to some kind of funk I don’t want to describe. Wipe the blade with something between cuts if you’re going through a pile of them.
The Case for Letting Them Cure (and Why the Science Is Kind of Cool)
After cutting, let the pieces sit out somewhere dry and airy for one to three days before you plant them. What’s happening is suberization, where the cut face basically grows a thin corky skin over the wound. The potato is doing what skin does. Sealing itself off so soil pathogens can’t just walk right in through the fresh cut.
In warm dry conditions this happens fast. In a cool damp Pacific Northwest spring it takes closer to three days and sometimes still feels like a gamble. Which brings me to the part where I admit I have planted un-cured cut pieces directly into wet May soil and lost probably a third of them to rot. That was a fun year.
If you’re in a hurry or the forecast looks bad and you just want to get them in the ground, plant whole un-cut tubers that have been chitted. Skip the cutting step entirely. Your yield per seed potato goes down but your survival rate in cold wet soil goes up. Totally valid trade-off.
Wood Ash or Sulfur: Optional, But Worth Having Around
Dusting the cut face in wood ash or powdered sulfur before planting is one of those cheap old-timer moves that actually has logic behind it. Both create a mildly inhospitable environment for the fungi and bacteria that cause soft rot. Sulfur lowers the local pH right at the wound surface. Wood ash is more of a desiccant and light antifungal situation.
I use wood ash because I always have some from the fire pit. Free, which as you know is my favorite price. Just roll the cut side in a light dusting right before planting. Don’t pack it on, you’re not breading a chicken.
Sulfur is cheap at most garden centers if you don’t have ash around. I’ve seen it at Sky Nursery for around $4.99 a bag, usually near the organic pest stuff. It’s the more consistent option, honestly, especially if you’ve had rot problems before. Either one beats planting a raw cut face into 50-degree soggy Redmond clay and just hoping for the best.
The Order of Operations for May Planting
If I’m doing this right, here’s what it looks like: chit on the windowsill for two to three weeks, cut larger potatoes into chunks with two-plus eyes each, let cut pieces cure two to three days somewhere dry, dust with wood ash, plant when soil is at least 50 degrees. Potato roots don’t really get moving below that temperature anyway, so planting into 45-degree soil is mostly just making the potatoes nervous.
A little more patience upfront. But I’d rather spend two weeks doing nothing on my windowsill than spend six weeks staring at bare ground wondering if I killed them again. The potatoes don’t care either way. I do.
Anyway, I-yam what I-yam, and I’m a guy who chits his potatoes now. You probably should too.
Photo by Markus Spiske on Unsplash
