Can a potato plant grow tomatoes? (2023)

Why do my potato plants have tomatoes?

Potato plants appear to be producing little green fruit, about the size of a large cherry tomato. These round, green berries are actually the fruits of the potato plant. It's not surprising that they look like tomatoes, since both plants are in the nightshade family.

Unfortunately, as many gardeners already know, tomatoes and potatoes are not good companion plants. Most advice strongly warns against planting these two together to avoid the risk of ruining your harvest and potentially other plants in your veggie garden.

After flowering, potato plants produce small green fruits that resemble green cherry tomatoes, each containing about 300 seeds. Like all other parts of the plant except the tubers, the fruit contain the toxic alkaloid solanine and are therefore unsuitable for consumption.

You can grow potatoes from store bought potatoes, but they are often treated with clorproham (an herbicide/sprout inhibitor). Potatoes without sprouts are more attractive on store shelves. However, treated potatoes take longer to sprout, and the resulting plants may show stunted growth.

You buy a bag of potatoes and before you can use them, they begin to sprout. Rather than throwing them out, you may be contemplating growing grocery store potatoes in the garden. Will store-bought potatoes grow though? The answer is yes.

The weather conditions have allowed the flowers to remain, pollinate and grow into small potato fruit. These look like small, round or oblong cherry tomatoes and usually appear in clusters. Those round seed pods are also called potato fruit, potato berries and seed balls.

Potato flowers and fruit are produced because this is how the plants naturally multiply themselves: by seed. As with most plants, potato plants bloom. Potato flowers look very much like tomato flowers except instead of being yellow, the potato flowers can be white or lavender or pink.

Pruning potato vines can help the potatoes mature earlier, before they attain their full size. Pruning potato vines and then leaving them in the soil for at least two weeks, post pruning, will help them develop a thick, protective skin.

Potato leaves can technically get eaten in small quantities, but they are poisonous. The leaves have a high concentration of solanine, a glycoalkaloid poison. Solanine can cause cramps, vomiting, and diarrhea.

Are fruits on a potato plant edible?

The fruits may look a lot like a tomato but are just the berry of the potato plant. The berries are not edible but they don't affect the development of the tubers. Although the fruit doesn't harm the growth of the tubers, the little fruits can be a dangerous attraction to children.

The small, round, green objects are the true fruit of the potato plant. While potato plants may bloom heavily in late spring, most of the flowers dry up and drop from the plant and don't develop into fruit. The fruit that do develop are relatively small and inconspicuous and often go unnoticed by most gardeners.

Small potatoes can be planted whole, but larger potatoes (bigger than a golf ball) should be quartered with a clean knife ($95, Williams Sonoma) before planting. Make sure each piece includes an eye or bud. To prevent rot, let the pieces dry for a couple of days before planting.

Cover each potato with about three inches of soil. After a few weeks, the potato plants will begin to sprout. Then you can gently fill the trench with another few inches of soil, leaving the top of the plant exposed. This is called “hilling” and it protects the potatoes from the sun, as well as supports the plant.

To produce well, shallow-planted potato require burying as they grow. Most potatoes form above the root system, and they can also form along buried sections of the stem. If you don't hill your plant, it will produce fewer potatoes even if it has lush foliage.

If potatoes you buy from the store do manage to sprout, you should plant them. Not only are store-bought spuds readily available, but you also don't have to wait weeks for them. Unlike certified seed potatoes for which you have to go through a long process and wait for delivery.

It's very easy to make seed potatoes for the gardening season. Choose your favorite potato variety. You can use any potatoes, from traditional white potatoes to Idaho and Russet. All you need are potatoes with eyes, and you're on your way to growing a great crop of spuds!

Although a cheaper idea, attempting to use non-organic supermarket potatoes for seed is not recommended, as they are often treated with chemicals to prevent sprouting during storage; hence, they will likely not sprout after planting. So, yes, you can save your own seed potatoes for planting the next year.

When you see flowers on your potato plants, I recommend cutting them off for two main reasons. First of all, you don't want the flowers to produce a fruit that small children or pets might be tempted to eat. Secondly, pruning the flowers is a great way to increase production of spuds.

You should allow your potatoes to flower. By harvesting after they flower, you allow the potato plant to grow to its potential. However, not all potatoes will flower or produce fruit. Whether your potatoes flower or not, the best time to harvest them is after above-ground greenery starts to turn yellow and die.

How long does it take for a potato plant to bear fruit?

How long do potatoes take to grow? Small new potatoes can be ready as early as ten weeks. However, full sized potatoes take about 80-100 days to reach maturity. Photo by: Kevin Lee Jacobs.

Answer: Actually, the fruits (they can be green or purple), about the size and shape of a cherry tomato, are not tomatoes, but instead true potato fruits. The tomato (Solanum lycopersicum) and the potato (S. tuberosum) are close relatives, both belonging to the Solanaceae family.

Flowering just means that the vines are mature enough and have enough leaf area to start forming tubers. It doesn't mean the tubers are ready to harvest. Until they reach mature size, your potatoes should be watered regularly though the summer, from 1 to 3 inches of water per week, as needed.

Stop watering your potato plants about 2-3 weeks before harvest, or when you first see the foliage on the plants starting to turn yellow. Make sure to harvest your potatoes on a dry day when the soil is dry—harvesting potatoes when wet or damp can cause the potatoes to rot more easily in storage.

When given too much fertilizer (especially nitrogen), potato plants will grow tall. Overgrown potato plants can get tall due to overfeeding (especially if you use fertilizer that is too heavy in nitrogen). This will promote lots of healthy green growth above ground.