Why Are My Potato Chits So Long and Spindly?

You pull out your seed potatoes after a few weeks of chitting and find them covered in pale, white shoots stretching several inches into the air. These are leggy chits — thin, fragile, and far less useful than the short, sturdy green sprouts you were hoping for. While a centimetre or two of sprout is exactly what you want before planting, long white etiolated chits are a sign that something went wrong during storage. The good news is this is one of the most preventable problems in potato growing, and even overly long chits can often be salvaged.

What chitting actually is

Chitting — also called greensprouting — is the process of encouraging seed potatoes to develop short, sturdy sprouts before you plant them. You stand them rose-end up (the end with the most eyes) in egg boxes or trays and keep them in a cool, bright, frost-free spot for four to six weeks. The ideal chit is about 1–2 cm long, dark green or purple, and quite firm. Done right, chitting gives your potatoes a head start that can bring harvest forward by two to three weeks and produces stronger, more uniform plants.

Why chits go long and white

Leggy, white chits are caused by the same thing that makes any plant grow spindly: not enough light. If seed potatoes are stored in a box, cupboard, shed, or any dark location while the chits are forming, the shoots race toward the light, growing long and pale in the process. The second culprit is warmth. A warm room combined with low light is the perfect recipe for spaghetti chits. Shoot elongation is driven by both darkness and heat, so cool conditions slow growth and keep sprouts compact. A warm kitchen windowsill sounds ideal but if the indirect light is poor, you will still get leggy chits.

How to fix and prevent it

Move the seed potatoes immediately to the brightest available spot: a cool windowsill, a well-lit unheated porch, a cold greenhouse shelf, or a bright frost-free shed. The chits already formed will not shrink back, but any new growth will be shorter and greener. For next time, start chitting in a light, cool place from the outset — around 7–10°C with as much indirect daylight as possible. An unheated spare room with a window is ideal. Avoid anywhere that drops below freezing or anywhere dark and warm.

Can you still plant leggy chits?

Yes, with care. If the chits are longer than 3–4 cm, you can snap the weak white tip off, leaving a shorter firmer stub — the seed potato will push out fresh green growth once in the soil. If the chits are extremely fragile, plant them very gently without breaking them and they will still produce plants, just without as much of a head start. The resulting crop will almost certainly be fine. Leggy chits affect early vigour and timing of emergence more than they affect final tuber yield, so even a wonky start can still produce a solid harvest with good growing conditions afterwards.