How to Plant Garlic in Alberta
The following information will help you learn how to plant garlic in Alberta, including varieties, planting dates, planting depth, techniques and plant spacing.
There are literally hundreds of varieties of garlic available worldwide, but only some of them can be grown well in Alberta. Of those varieties, they can all be grouped into two types called hardneck and softneck.
Hardneck varieties bolt during late spring or early summer, producing a flower stalk called a scape. At the tip of the scape is a capsule containing bulbils (small aerial cloves) is produced instead of a true flower. You should remove these scapes to maximize the size of your bulbs at harvest.
Softneck varieties do not produce a scape, although they sometimes produce bulbils in the stock of the plant, especially in cold climates.
Purple Stripe variety (left) and a Porcelain variety (right)
The two Softneck family groups grown in Alberta include Silverskin and Artichoke, although the Artichoke family tend to do better because it is more and suited to Northern climates.
When choosing garlic varieties to grow, you want to find ones that are cold hardy, develop large bulbs and have great flavour. Most Canadian garlic meets these criteria, however, the three most popular varieties that we grow on our farm are Music, Spanish Roja and Persian Star. They consistently do well and often outperform other lesser known varieties.
In Alberta, garlic is usually planted in the fall so that cloves are exposed to the cold temperatures (vernalization) that many types of garlic require. Garlic can be planted in spring, however, the plants often form single cloved bulbs (called rounds) and or they grow normal bulbs that are much smaller than the fall planted cloves (see our Planting Garlic in Spring article for more info).
The best fall planting date for garlic depends mostly on where you live in Canada. Your goal is to plant early enough to have the cloves develop a large root system, while at the same time planting late enough that garlic clove don't sprout and show green top growth above the soil.
In Alberta, this means that the date for planting can range from the middle of September until the last week of October. In the warmer southern regions the first week of October is ideal, while in the more northern locations the last week of September is the best target date.
If you plant your garlic early in the fall, you can sometimes end up with a small amount of green top growth above the soil line going into winter. These first green leaves may die back if they are exposed to very cold temperatures, however, the cloves will re-grow new leaves in spring.
A garlic clove that was planted early and emerged from the soil before winter.
Planting garlic in nice straight rows or in a uniform layout is also highly recommended. Garlic tends to require a lot of weeding, and straight rows makes this much easier. Using a string, long stick with markings or a dibbler to indicated perfect spacing helps significantly.
When possible, garlic cloves planted by hand should be pushed into the soil with clove tips pointed upward and their flat bottoms pointed down. This allows the first leaves to emerge from the ground easily in spring and ensures that the garlic necks do not grow crooked. This is more important with hardneck garlic varieties as upside down cloves often form smaller, odd shaped bulbs.
Another option used by larger garlic growers and some gardeners, is to plant cloves on their sides, which makes the process easier and saves time. A long furrow is dug the length of the planting area, cloves are laid on the bottom and the furrow is covered with soil burying the cloves.
When using this method, most of the garlic plants will develop normal shaped bulbs, however, some of them will sometimes be slightly misshapen. Softneck cloves tend to be affected the least by side planting and tend to turn themselves upright which allows the bulb to form normally.
A furrow being dug before planting garlic cloves on their sides.
Garlic cloves can be planted anywhere from 1 to 3 inches (2.5 to 7.5 cm) deep. Some growers plant deeper than 3 inches, however this only works well in very loose and fluffy soils that drain very well.
Generally any deeper than 3 inches is excessive and will force the garlic cloves to use valuable energy when emerging from the soil, limiting the size of the harvested bulbs due to the force of the soil pushing down on the bulbs while growing.
How deep you choose to plant your cloves will depend on two factors. First is the type of soil you have and how well it drains. In poorly draining soils like clay, or regions that generally receive high amounts of rain, planting deeper than 1 or 2 inches can cause the garlic to rot during cool temperatures or during wet periods. In sandy or very well drained soil, planting less than 2 or 3 inches can lead to drought stress during dry periods.
The second factor to consider is the climate of your region. The deeper a garlic clove is planted, the more winter protection it has. In Alberta where winter is very cold most years, it is recommended that cloves be planted on the deeper side in order to help protect them over the winter.
Planting garlic cloves 1-inch deep in heavy clay soil.
Cloves can be planted anywhere from 4 to 8 inches (10 to 20 cm) within the row and 6 to 12 inches (15 to 30 cm) between rows, with wider spacing sometimes used to accommodate equipment.
How close or how far apart you decide to plant your garlic will depend on how you plan to weed around the plants, your space limitations, the type of garlic being grown and your goals regarding size and quality.
Space for Equipment
For growers using equipment such as tillers or tractors for tasks like weeding, the spacing of the garlic has to allow for movement of the equipment through the field or garden.
Enough space must be given to ensure that tiller tines or tractor wheels don't hit the sensitive garlic plants or roots even when they are almost full grown. What looks like a lot of space when planting the cloves in fall, often seems too close once the garlic is growing during the summer, so using a wider spacing is a good idea.
Garlic planted in rows 12 inches apart between rows and 6 inches within the row.
Space for Small Areas
If you have a small growing area, have good soil and want as much garlic as possible, then planting your garlic with very close spacing is a good option. Some of the nicest looking garlic in Alberta is grown by market gardeners or homeowners that use very tight spacing.
The key to their success is supplying adequate moisture to the plants, consistent weed control and high soil fertility. If you have a large area or marginal soil conditions, then using a wider spacing is usually a better choice. This will reduce the competition between your garlic plants for water, light and nutrients as well as make your job of weeding much easier.
Space for Large Varieties
If you are growing a variety of garlic that tends to produce large bulbs and/or you are trying to grow the absolute largest garlic possible, then giving each plant a large amount of space is the best practice.
In general, individual garlic plants do not need a very large amount of space, however, using a plant spacing on the wider side will definitely improve your chances of growing large, healthy garlic that looks uniform.