Do You Need to Chit Potatoes Before Planting?

Yes, chitting potatoes is not strictly necessary, but it gives you earlier harvests and stronger plants, especially if you have a short growing season or want to beat pests like slugs. It simply means sprouting seed potatoes indoors before planting in the ground. For most home gardeners, a little chitting can make a real difference in yield and timing.

What Does It Mean to Chit Potatoes?

Chitting (sometimes called "greening" or "sprouting") is the process of encouraging seed potatoes to develop short, sturdy sprouts before you put them in the soil. You place the potatoes in a cool, bright spot out of direct sunlight for a few weeks. The sprouts grow from the "eyes" of the potato. Once the sprouts are about ½ to 1 inch long and look strong, the potatoes are ready to plant.

Think of it as giving your potatoes a head start. Instead of waiting for the soil to warm up and trigger sprouting on its own, you control the timing. This is especially useful in cooler climates where the growing season is short.

Do All Potato Varieties Need Chitting?

No, not all varieties benefit from chitting. Here’s a quick breakdown:

• Early varieties (first earlies and second earlies) – These are the ones that benefit most. Chitting early potatoes like 'Charlotte', 'Rocket', or 'Swift' can help you harvest up to two weeks earlier.
• Maincrop varieties (like 'Russet Burbank' or 'King Edward') – Chitting can still help, but the advantage is smaller. These potatoes are meant for long storage and later harvests, so early sprouting is less critical.
• Seed potatoes from reputable sources – Many seed potatoes have already been pre-sprouted by the supplier. Check the label. If they already have tiny sprouts, you don’t need to chit further – just plant them.

In short: chit your early varieties for the biggest payoff. Maincrop potatoes can be planted directly if your soil is warm enough.

How Soon Before Planting Should You Start Chitting?

Start chitting about 4 to 6 weeks before your planned planting date. For most gardeners in temperate zones, that means starting chitting in late winter (around February or early March) if you intend to plant in mid-spring.

Why 4-6 weeks? Because it takes time for the sprouts to appear and develop to that ideal half-inch length. If you start too late, you won't get much head start. If you start too early, the sprouts can become long, pale, and brittle – that's a sign they're searching for light and may break off during planting.

To check your schedule, find your local last frost date and count backwards. Potatoes are usually planted 2-4 weeks before the last frost, so chitting should begin 6-8 weeks before that date.

What's the Step-by-Step Process for Chitting Potatoes?

Follow these simple steps for successful chitting:

1. Pick healthy seed potatoes. Buy certified disease-free seed potatoes from a reliable source. Avoid using grocery store potatoes – they can carry diseases.
2. Choose a container. Egg cartons work perfectly for small potatoes. For larger ones, use shallow trays or flats. You want each potato to have some space around it.
3. Place the potatoes upright with the "rose end" (the end with the most eyes) facing up. That's the blunt end.
4. Put them in a cool, bright spot. An unheated room, a cool windowsill, or a garage is ideal. The temperature should be around 45–55°F (7–13°C). Light is crucial – it keeps the sprouts short and sturdy. Direct sunlight is too warm, but bright indirect light is perfect.
5. Check weekly. Turn the potatoes gently and remove any that show signs of rot or mold. Sprouts may take 2–4 weeks to appear.
6. Plant when sprouts are ½ to 1 inch long. If a potato grows multiple sprouts, leave only the 2–3 strongest ones (rub off the rest with your fingers). This focuses the plant's energy.

If you want to be extra careful, place the potatoes in a single layer on a tray. A simple seed-starting tray or even a cardboard box lid works. Just make sure there are drainage holes if you use a container that holds moisture.

When Is Chitting Most Helpful?

Chitting is most helpful in these situations:

• Short growing season: In northern regions (USDA zones 3–5, or UK north of the Midlands), every extra week counts. Chitting gives you a 1- to 2-week jump.
• Want an early new potato harvest: If you crave tender, waxy new potatoes in early summer, chit your first earlies.
• Cool, wet spring: If the soil stays cold and wet, chitted potatoes can rot in the ground. Wait until soil temperature is at least 45°F before planting.
• Protection from pests: Sprouted potatoes have a head start, so they can grow faster than slugs and wireworms can damage them.
• Container gardening: In pots or grow bags, a chitted potato is less likely to be crowded by weeds or competition.

What Are the Downsides of Chitting?

Chitting isn't perfect for everyone. Here are a few drawbacks:

• You need space and light. Not everyone has a cool, bright area for 4–6 weeks. A basement without windows won't work.
• Risk of frost. If a warm spell followed by a frost occurs, you can't plant the chitted potatoes too early. Wait for safety. Some people plant in temporary cloches or row covers.
• Long, weak sprouts. If you start too early or keep them in darkness, the sprouts get leggy and snap off easily. That defeats the purpose.
• Extra handling. Chitting requires weekly checks. If you prefer a hands-off approach.

For many gardeners, the benefits outweigh these minor hassles, especially for early crops.

How Long After Chitting Should Potatoes Take to Grow?

Once planted, chitted potatoes usually emerge above ground in 2–3 weeks, depending on soil temperature. By contrast, unchitted potatoes can take 4–6 weeks to appear. That's a big difference if you're racing against a short summer.

After planting, chitted potatoes also tend to set tubers a little earlier. Expect to start harvesting first earlies roughly 10 weeks after planting. Maincrop potatoes take 15–20 weeks after planting. Chitting can shave off about 2 weeks from both of those times.

Can You Plant Potatoes Without Chitting?

Yes, absolutely. Many gardeners plant seed potatoes directly into the ground without any chitting. If your soil is warm (above 45°F) and you have a long growing season, you'll get a fine harvest. The potatoes will still grow, but they'll emerge later and may be more vulnerable to soil-borne pests and rot in cold, wet ground.

In fact, some potato varieties are specifically bred to be planted without chitting – look for the label "no need to chit" or "direct plant" on seed potato packaging. For home gardeners with plenty of time, direct planting is simple and works well.

If you're a beginner, you can skip chitting entirely. Just plant healthy seed potatoes at the right depth (4–6 inches), keep the soil moist, and you'll get potatoes. Chitting is a bonus, not a requirement.

Simple Chitting Checklist

What Tools Do You Need for Chitting Potatoes?

You don't need much to start. The basics include:

• Healthy seed potatoes – Look for certified disease-free stock. Check out seed potatoes on Amazon for a wide selection of early and maincrop varieties.
• Egg cartons or shallow trays – Recycle cardboard egg cartons – they hold each potato upright and allow good air circulation. For larger amounts, consider a seed starting tray with drainage.
• A garden trowel – You'll need a sturdy trowel for planting later. A good option is the stainless steel garden trowel – it lasts for years.
• Labeling supplies – Not necessary, but helpful if you're growing multiple varieties. Use popsicle sticks or plant tags.

Remember, chitting is simple. You probably have everything you need at home already.

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