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Leek Gardening

Leek

What is a Leek

The leek (allium porrum), a mild flavored member of the onion family, is a hardy biennial grown as an annual in the vegetable garden. However; unlike onions and shallots, leeks do not bulb, they are straight stalk plants. They are grown for their thick, juicy, mild flavored stems. The edible part being the lower stem.

The leek is known as the gourmet's onion because of their mild flavorIf left in the garden, and if they survive winter weather, they will flower in year two and go to seed, as does parsley.

The top growth of leeks (the leaves), called the flag, are thick and strap like and are colored green to dark blue-green. The top growth does not die back as the plant matures.

Leeks contain the following vitamins and minerals:

Vitamins – Vitamin A, Thiamine (B1), Riboflavin (B2), Niacin (B3), Pantothenic acid (B5), Vitamin B6, Folate (B9), Vitamin C, Vitamin E, Vitamin K

Minerals – Calcium, Iron, Magnesium, Manganese, Phosphorus, Potassium

Leeks can require a long growing season—up to 170 days. They grow best in cool, mild weather.

They require little to no attention and are generally pest-free. In the kitchen, they can be substituted for onions. Leeks can be chopped and frozen for later use.

Types of Leeks

There are two types of leeks: short-season (non-hardy)and long-season (hardy).

Short-season leeks, also known as summer leeks, have thin stems. They mature in about 60 – 90 days and are harvested during the summer and early fall. They can be harvested and used like scallions when young. Summer leeks are not winter hardy and do not store as well as long-season leeks. Good varieties of summer leeks are:

Alto Leek early summer – High Mowing Seeds
King Richard Leek – High Mowing Seeds
Chinook Leek – Territorial Seed Company

Long-season leeks, also known as winter leeks, have thick, cylindrical stems. They take about 100 – 170 days to reach harvest. Long-season leeks are harvested late summer through the winter. They store well either inground or in cold damp sand. Good varieties of winter leeks are:

Bandit Leek – High Mowing Seeds
Tadorna Leek – High Mowing Seeds
American Flag – Ferry Morse

Where to plant

First, if you can, you should rotate the location of where you grow your vegetables – and that also includes leeks.  Try to move them to a new bed to avoid sections where they, onions or garlic have grown in the past year. This helps avoid the pests and diseases that can cause problems or ruin the crop.

Leeks like full sun, however, they do tolerate partial shade. Plant in well-drained soil rich organic soil with a pH of 6.0 to 6.8.

When to plant

Winter leeks take up to four (4) months to mature, if you live above zone 7, you should sow your winter leek seeds indoors in early spring. Start the seeds indoors about 2 – 3 months before the last expected spring frost – check the Plant Hardiness Zone Map

Transplant seedlings into the garden as early as 1 to 2 weeks before the last expected spring frost. Leeks should be in the garden no later than early summer for autumn harvest.  They will survive light frosts even when young — and heavy frosts in the fall.

If you live in planting zone 7 and warmer, you can plant winter leeks directly into the garden about the time of the last expected spring frost.

Summer leeks can be sown directly into the garden about the time of last spring frost dates.

Unused seeds can be kept up to 3 years.


How to Plant

First, mark your rows and remove the top 6 inches of soil in each row to create trenches. Space leek transplants 6 inches apart when planting. They grow best in temperatures between 55° and 75°F. Growth will be slowed by hot weather. Planting beds should have well-aged manure and compost.
Sow leek seeds ½ inch deep. They typically germinate in 10 to 14 days at 70°. When the seedlings reach about 8 inches, thin to 4 to 6 inches apart. Rows should be spaced 12 to 16 inches apart. Stagger the plants in each row so they are not uniform, this will allow the plants more room to grow.
As the plants grow you will need to use the removed soil to back-fill around the stems (you may fill in 2 -4 times during the growing season). This will blanch the lower stems that get covered. Blanched stems will be white and tender. Another way to blanch stems and avoid playing with dirt is to use leaves and grass clippings. I tried this in 2020 and it worked fine – it also kept the plants dirt free.

Plant Care

If you start your leeks indoors keep the tops trimmed  to about 4 inches tall to encourage stocky stem growth. When the weather is good, transplant into the garden.

Keep the soil around leeks evenly moist; water when the surface becomes just dry. Feed plants with compost tea or worm tea every four weeks during the growing season. If using normal fertilizing methods, you should spread 5-10-5 fertilizer every 3 to 4 weeks at a rate of 5 ounces of fertilizer per 10 feet of row.

Soil that tumbles into leaf folds can wind up trapped between skin layers in the stem. To keep this from happening you can slip a section of paper tube, such as from toilet tissue or paper towels, over the plants while they are still young as early as planting time. The tube will rot over the growing season but will help prevent soil from getting into leaf bases during early growth.

The closer together you plant leeks, the smaller they will be. Commercial growers usually place them about 6-8″ apart and don’t thin them. A good technique for home gardeners is to plant them just 2-3″ apart and achieve proper spacing by harvesting leeks as you need them. These young leeks are a good substitute for green onions in the kitchen.

After planting, mulch the bed with straw (I hate Straw) or other organic material (try shredded paper) to help soil retain moisture. Water plants as needed until they are established. Plants require an inch of water a week, either through rainfall or irrigation. Inconsistent moisture may cause tough stems.

Pests

On young plants, slugs can be devastating. Gather them at night, set traps, or use biological control.

Diseases

If there is a lot of rain in winter or early spring, leaf rot can set in. Rot shows as white spots on leaf tips that eventually shrivel. At this point there is not much you can do except pull the rotted plants and thin the planting to increase air circulation.



In summer orange pustules on leaves indicate leek rust, which is worse in wet growing seasons. Remove affected foliage; later maturing foliage will be healthy

Harvesting

You can pull leeks any time. Typically, you want them at least 1 inch or larger in diameter, but you can dig young ones to eat like green onions / scallions. Leeks have large root systems so use a hand fork or garden fork to loosen the soil before lifting the plants. A 10-foot row can yield up to 15 to 20 mature plants.

In colder areas, extend the harvest season by mulching deeply around plants (up to 1 foot deep). You can continue harvesting leeks but when a hard freeze is expected dig them up.

In zones 7 and warmer, you should be able to harvest leeks all winter long.

Storing

Initially, when harvesting leeks, shake and brush off as much soil as possible then rinse the plant thoroughly. To freeze leeks, wash, slice, and blanch for 1 minute in boiling water. Drain, drip dry, and toss into plastic freezer bags.

Store leeks wrapped in a damp paper towel in a perforated plastic bag in the refrigerator for 7 to 10 days. Smaller leeks store better than larger leeks. Trim the roots and wash the leaves and stem before refrigerating.

For longer storage in coldest zones, dig leeks with roots attached. Cut leaves back until just an inch of green remains on each leaf. Place stems in a box (root side down) and pack with sawdust, clean sand, or vermiculite. Keep the packing moist and store in a cool place. Stems will keep up to 8 weeks

Starting Gardens using Seeds

Starting Gardens using Seeds

Growing your own food is both cathartic as well as an environmentally conscious endeavor. Starting gardens using seeds takes gardening to the very root of the process. By taking it upon yourself to raise your own “crops”, you will know exactly what has gone into & onto your food. I have been gardening most of my life, sometimes having unbelievable years with excess so much that canning and preserving became a nightmare while in other years I scratched my head trying to come up with an answer to that year’s failure. I try to grow “as organic as possiblStarting Gardens using Seeds. Setting up trays for seeds is importante. I fight the pests and weeds as organically as possible. When the garden starts to produce and we eat the first tomato or pepper, knowing it is clean of harmful synthetic chemicals is comforting. Also knowing the food came from 200 steps away and not 2,000 miles away along with the associated costs is well, rather satisfying.

A few years back I decided to venture out and try varieties that could not be bought at the local commercial greenhouse. Tomato varieties such as Cherokee purple and yellow pear were not offered yet they are our favorites. Buying pre-started beets were more expensive than just buying produce from the local supermarket. I also want to know what the heck I am growing and eating. The goal was heirloom, organic and nothing GMO. In order to do that I had to plant my own seeds.

There are a lot of articles out on the web today about starting seeds and the ease of doing so. I recently read an article that soft pedaled the process, and in my opinion, got it wrong. Frankly, it is easier to go to the local greenhouse and buy a flat of whatever and plant than it is to start your garden with seeds. If you decide to buy plants, you will be limited to the varieties and types of vegetables you grow but you will have less sweat in the game. Going down to the store and choosing packets of seeds is easy (and fun) but you are just at the beginning of a long process. Considerations such as where to house the seedlings, the amount of space needed, planting medium, temperature, humidity, time and lighting should be thought out and handled before you ever plant your first seed.

Housing your plants & space

Before you buy the first packet of seeds, a plan needs to be made as to where your plants will be housed. Considerations as to space:
Do you want 5 plants or 100? You will need to plant more seeds per type of plant then you will end up putting out into the garden. Plan for seeds not sprouting, seedlings dying and seedlings that will not grow. My rule of thumb is, plant 1 ½ times more then you need. Your space considerations should take this into account.

Will you use stand-alone individual containers, or will you use seed trays? For corn I go with large containers right from the start. I plant the seeds in mid-April and move them to the garden in late May. Beans are started in late April in small flats and then moved to the garden in late May, same goes for cabbage, cucumbers, squash, etc. Tomatoes, peppers and eggplants are started in small flats in early March, right after they set their first true leaves, I move them into 2” x 2” cups before ultimately going to the garden in very late May. Spinach, beets, carrots and onions are planted straight into the garden.

Do you have enough containers? If you want ten good tomato plants – plant 45 seeds in 15 cups (15 cups being the 1 ½ times rule). Expect 8 seeds to be crap, 4 seedlings to die and 8 seedlings to be just garbage. That would leave you with twenty-five plants to choose your ten from (quick note, you want to get to 1 plant per cup, you will need to pull extra seedlings – be merciless). If the seeds all sprout, and you are like me, you can care for them, plant them in individual pots and at the end – share any excess plants with family and friends.

Is the space you are thinking of warm enough? In my first shot at starting seeds, I planted in my basement. The temperature was in the high 50’s. The tomatoes, peppers and eggplants did not spout for 3 weeks. I finally moved them upstairs and they sprouted within a week. I moved them back to the basement and the cold temperature on those warm weather vegetables stopped their growth. They went into the garden in late May and did terrible – word of warning.

Is there an ability for fresh air and/or air movement? Stagnant air can potentially lead to disease (damping off) and/or unhealthy plants. The ability to bring in fresh air or at least moving air, in my opinion, is good. If you use a fan to move air within the plant nursery, the airflow will help move stale air away along with the added benefit of making the plants a bit hardier & stockier.

Are there ample electrical outlets available? – yes you will need electricity. You will need electrical outlets for lighting. Being able to use fans is good (see above). If the area is cold, you will want to use a heater to raise the temperature.

If the seedlings turn to small plants before you can get them outside and into the garden, do you have larger containers they can be replanted in and is the space large enough to handle the larger containers needed?

Planting medium

You can, but you should not, use soil from your garden to start your seeds. Garden soil is usually heavy and may have lots of little critters, organisms, fungus, etc., issues you really do not want to deal with when starting your seeds. There are a lot of seed starting soils on the market today and most are good. The best are light mixes, vermiculite and peat along with other stuff. They will hold moisture, are lite enough for the seeds to sprout without too much wasted energy and are proper PH (proper PH is very important). If you want to create your own starter soil try: 80% vermiculite and 20% potting soil.

Temperature

As mentioned before, if you plant warm weather seeds in a cold area expect little to nothing. Articles note that tomato seedlings cannot process nutrients correctly in cool conditions.  Most gardeners want summer vegetables and that means a warm “nursery”. Try to make the area around 70°F. You can spend the money on heat mats – they do work, I have one that I use to give tomato and eggplant seeds an extra bit of care. The mats are an added expense and … require electricity. The better choice is a space heater – not a crap one that will catch fire but a decent one that has good temperature control and is powerful enough for your nursery space. Remember when starting seeds, you need to do it right.

Lighting

Unless you have a greenhouse and can provide roughly 8 – 10 hours of sunlight each day, you will need lights. As everyone should know, normal house lighting will not do a good job, they will work but your seedlings will not get what they really need. House lights do not provide the full spectrum of light waves that seedlings and plants need to flourish. My first “grow lights” were florescent tube full spectrum grow lights – the setup was expensive. Today there are LED’s that can be bought cheaply, and last much longer than florescent tube lights, on Amazon that can be put into any house-light fixture. 2 – 4 lights and you have a well-lit nursery for your seedlings.

Moving your plants outdoors

When the time comes, and it will be different for each variety of plant, you will set the young plant out to “harden up”. This is not so the plants are acclimated to the temperature – do not even think of doing that. Putting tomato plants, etc. out into 50°F days are 40°F nights will only stop their growth, so much so that the plants will have a tough time getting back on track. All the work you did will end up for naught. Moving the plants out should be done at each type’s ideal temperature. When starting gardens using seeds, the hardening is for the plants to get used to the direct sunlight. Plants cannot go from a “grow light” environment directly into sunlight. Too often the plants and their leaves are not ready – too much sunlight too soon can burn the leaves and kill the young plants. The best way to harden off the plants is a week-long process such as:

Day 1 & 2 – put plants in direct sunlight for no more than 2 hours. Remainder in shade or back under the grow lights. IF THE plants look good
Day 3 & 4 – put plants in direct sunlight for 3 hours. Remainder in shade or back under the grow lights. IF THE plants look good
Day 5 & 6 – put plants in direct sunlight for 4 hours. Remainder in shade or back under the grow lights. IF THE plants look good
Day 7 & 8 – put plants in direct sunlight for 6 hours. Remainder in shade or back under the grow lights. IF THE plants look good – plant them.