07/03/2026
We believe strongly that it makes a lot of sense to plant early blight resistant varieties and leave main crop potatoes to the commercial organic growers.
But here is another interesting fact, that is often forgotten:
DETERMINATE vs INDETERMINATE POTATOES
Did you know that, like tomatoes, potatoes are either determinate or indeterminate?
We didn’t until we read about it in the Kitchen Garden Magazine February 2026 edition. Seems logical as they are both in the nightshade family (Solanacea). Why is it important? Knowing which type you have can help you to make sure that your growing method leads to maximum yields.
Determinate varieties grow their tubers in a more single-layered arrangement, just below the soil surface and above the seed potato. They can be sown at a depth of 10cm. They don't require repeated earthing up and are perfect for containers because they don't need a big depth. Because the potatoes grow close to the surface it is best to mulch around the base of the plant to prevent tubers from greening. Determinate varieties tend to be early varieties, producing in and around 90 days.
Best known varieties are Orla, Prada, Charlotte, Sharpes Express, Alouette, Vitabella, Vitanoir, Peter Pan and Vivaldi
Indeterminate varieties will grow in multiple layers and produce tubers along a taller section of buried stem, meaning earthing up increases yield. They are best sown at a depth of 15cm. These varieties – frequently main crop to late main crop – need 90 -120 days or up to 150 days to mature and often produce heavier crops. As the plants grow, earthing up will encourage the production of more tubers.
Indeterminate varieties lend themselves to growing in in bags and containers, where additional soil/compost can be added as the plant grows.
Best known varieties are Désirée, Cara, Valor, Rooster, Nicola, Maris Piper, Picasso and Pink Fir Apple.
