March is a great time to plant potato plants. Many gardeners plant the first of February and then cover their emerging plants with leaves and warm compost. I've waited until now because my winter garden is so full of lettuces, broccoli, Kale, Garlic, Onions, Swiss Chard, Artichokes, Sugar Snap Peas, Lemongrass, Spinach, and Radishes. I have no room, yet. So, I'm starting my potato plants from Certified seed potatoes. Choose from white, yellow, golden, red, even blue and purple. See the Washington State University Potato List. Hold down your control key and push enter to open a new window to get a list of many potato varieties. There are many varieties in existence. Though not many available locally, there are enough to suit any palate.
- Certified seed Potatoes from a nursery. DO NOT use grocery store potatoes, since they are not certified grown and inspected by your county agricultural inspector and could introduce unwanted diseases into your garden. On my trip to Ireland, an entire city was dedicated to education about the potato famine of 1845.
- Sphagnum moss raw and rolled (not milled). and a 5 gallon bucket of clean water.
- A sharp knife.
- A flat bedding container made of plastic.
If you use potatoes that are small- that only have two or three eyes each, then you can skip this entire process and just plant directly into the ground.
I bought a bag of La Soda Red potatoes for $5.00 and made 50 potato starts, making my investment ten cents per plant. I expect to get 10 potatoes per plant, so I'll be paying a penny per potato. Some will be small and useful for breakfast frying with butter (yummy). Some will be large for stuffing. All will be creamy and flavorful and organic.
The process is to cut the medium and large potatoes into pieces that will have two eyes each, making sure the eyes have some potato "meat" with them. They will use this potato starch as they start to grow. Some eyes may already be sprouted. Leave the sprouted parts on and they will grow quicker. Keep your knife and workspace clean to prevent diseases getting on the potato pieces. Let the cut parts scab over. This might take a few hours or overnight. Small potatoes do best to remain uncut and plant well directly into the ground. They would have the diameter of a silver dollar or smaller.
Prepare the sprouting flat by lining the bottom with water saturated Sphagnum moss. The best way to get the moss wet is to douse it in a bucket of water until all the bubbles are out of it. this may take fifteen minutes or more. Use this same method when using raw moss to make hanging wire baskets. Then unroll enough to cover the bottom of your flat. Place your potato pieces onto the Sphagnum "eyes up" carefully, so you don't break any sprouting parts. Then, gently place another layer of Sphagnum on top of the pieces to keep them moist. Water thouroghly. Cover with plastic at night to keep from freezing. Do not let the plastic stay on during sunny days or the potatoes will cook. In about 4 weeks you'll see lots of green growth that resembles tomato plant leaves, to which they are related. It's now time to plant them into your garden.
Potatoes need deeply tilled soil. If your roto-tiller doesn't till deep enough, use a shovel and dig down at least 12" and add lots of compost. Rake the area flat. Rake slight trenches and mounds to make rows. Place the potato pieces onto the sides of the mounds and cover them with the soil from the tops of the mounds. Place them two feet apart alternating sides of the rows. Use the shallow trenches to water. Apply water as needed, which is usually two times per week. Cover with mulch if rain erodes the soil over potato pieces. Potatoes can be buried somewhat and still produce abundantly. Some gardeners cover them with straw and get potatoes growing in the straw. If you try this, be sure the leaves are still above the straw and getting plenty of sunshine so they can manufacture food to make potatoes for you. Do not step in the bed. Loose soil produces more than compacted soil. Some gardeners make a tower of potatoes using old tires and fill the tires with straw as the potato plant grows. Then, to harvest, they just lift off the tires one by one and pick out their meals. You can plant different colors in the same tire if you are short on space.

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