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Potato Growth Stages (Potato Development) – GIY Plants

Three different Potato Growth Stages, seed potato, sprouting and vegetative.

Potatoes, a beloved staple worldwide, go through a fascinating journey from seed to harvest. In this article, we discuss the intricate potato growth stages, equipping you with the knowledge to optimize your potato yield, whether you’re a novice gardener or an experienced farmer.

Sprouting Your Seed Potatoes

Three potatoes with "eyes" or buds ready to use for planting.

The journey of potato plant growth begins with a seed potato. These aren’t the typical seeds you’d imagine, but small potatoes or pieces of larger potatoes with “eyes” or buds. These eyes are the start of sprout development and where your potato plant will begin to grow.

When the seed potatoes sprout, the sprouts become stems, growing upwards, and roots, extending downwards. The sprouts will soon become the stems and leaves, the top part of the plant visible above the soil.

This stage begins right after planting and lasts approximately 1-2 weeks.

Vegetative Growth Stage

Potato plant in the vegetative growth stage growing in the ground.

The second stage in the potato growth cycle is the vegetative growth phase, where the above-ground part of the plant, the stems, and leaves, begins to flourish. This part of the plant works hard to photosynthesize and provide the necessary energy to grow new potatoes.

It’s essential to maintain optimal growing conditions during this stage. Ensure you keep the soil well-watered but avoid waterlogging. Regular hilling (piling soil around the base of the plant) prevents the formation of green potatoes, which are toxic due to the presence of solanine.

This stage begins when sprouts emerge from the soil and continue for about 5-7 weeks.

Tuber Initiation Stage

Potato plant forming a tuber and roots.

The tuber initiation stage is an exciting part of potato growth, where the stolon, a part of the stem, develops into the actual tuber or potato. This formation happens underground, marking the transition from vegetative to tuber growth.

Numerous factors, including soil temperature and soil moisture, influence tuber initiation. Cool soil conditions around 59-68 degrees Fahrenheit are ideal for tuber formation. This stage is crucial; any stress can reduce the number of tubers produced per plant.

Overlapping with the later part of the vegetative growth stage, tuber initiation typically starts around 3-5 weeks after planting and can last 2-3 weeks.

Tuber Bulking Phase

Potato tubers are growing well and almost ready for harvest.

Next comes the tuber bulking phase, where the baby potatoes grow and expand, feeding off the plant’s photosynthesis. This is when your potatoes gain their mass.

At this stage, watering becomes even more crucial. Irregular irrigation can lead to defects such as hollow hearts or cracked potatoes. Maintaining a consistent soil moisture level can ensure the production of good-quality potatoes.

This stage generally begins about 2-3 weeks after tuber initiation and lasts 6-7 weeks, depending on the potato variety and growing conditions.


Maturation and Harvest

Potatoes being harvested out of the garden with a broad fork.

The final stages of potato growth are maturation and harvest. When the potato plant leaves turn yellow and die back, it’s an indication that the potatoes are ready to be harvested. It typically takes around 2-4 weeks. Depending on the variety, the time from planting to harvest can range from 70 to 120 days.

For new potatoes or baby potatoes, you can harvest them earlier when you plant flowers. However, for larger, mature potatoes, wait until the plant reaches maturity and the vine growth has ceased.

Using a garden fork, carefully dig your potatoes, ensuring not to damage the tubers. After harvest, potatoes are cured for storage to toughen up their skin. Finally, store potatoes in a cool, dark, and humid environment to prevent them from sprouting.

Varieties of Potato Plants

From sprouting to harvest, the growth cycle is essentially the same across all potato varieties. However, some differences arise, particularly in maturation time. Early types are usually ready to harvest in 70 to 90 days, while maincrop varieties yield large potatoes and may need up to 120 days.

The choice of potato variety depends on your personal preference and intended use.



Growing potatoes can be a gratifying experience, from planting the seed potatoes to harvesting a crop of your own fresh, home-grown potatoes. By understanding the different stages of potato growth, you can effectively care for your potato plants, yielding better.

Whether growing potatoes in soil or experimenting with hydroponics, your newfound understanding of the potato life cycle will guide your gardening endeavors.

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