It's hard to believe there was a time when garlic wasn't a staple in the kitchen. Today there are over 600 cultivated sub-varieties of garlic throughout the world.
All garlic belongs to the genus Allium and the species sativum. The species is further divided into softnecks var. sativum and hardneck var. ophioscorodon.
Garlic originated in central Asia, where they have cold winters and damp springs. Today's hardneck varieties still prefer these conditions and are favored by northern growers. Luckily, softneck varieties developed from the hardnecks can be grown in warmer climates.
Hardneck garlic gets its name from the stiff stalks, or neck, of the garlic plants. Hardneck garlic tends to have fewer cloves than softneck varieties, with the uniformed-sized cloves circled around a central stalk.
Hardneck garlic includes three distinct varieties:
- Rocambole: The most often encountered hardneck type and the term 'rocambole is sometimes used synonymously with hardneck. Rocamboles have parchment skins that are quite a bit thinner than softneck varieties. These thin skinned bulbs don't store long, but they peel easily. Rocombole garlic is the type you'll see with the distinctive curling, topset scapes that give them the nickname "serpent" garlic. These topsets are called bulbils. Garlic can be propagated from bulbils, but you’ll need to wait two years for the plants to develop. Popular 'Spanish Roja' is a rocambole.
- Purple Striped Garlic: All purple striped garlic varieties exhibit some stripping, but that's where the similarity ends. Some are very mild tasting and some are extremely pungent. They even mature over a range of times. Two nice varieties to try are 'Starbright', with a kind of nutty flavor and 'Chesnok', which holds up well when roasting.
- Porcelain Garlic: Features a plump bulb with only a few fat cloves. Porcelains are covered in a very thick outer skin, making them a good choice for storing. 'Georgian Crystal' is at the mild end in flavor while 'Romanian Red' has a hot, lingering tanginess.
Softneck garlic, as mentioned, is well adapted to warmer climates. It is softneck garlic that you are likely to find in the grocery store because softneck garlic stores and travels better than hardneck.
The two types of softneck garlic you are likely to encounter include:
- Artichoke: The most commonly grown commercial garlic. It has a couple of concentric rows of cloves and tends to be very difficult to peel. But it produces and stores well and this is what you probably buy at the grocers. 'Red Toch' is a well-known Artichoke variety.
- Silverskins: This type of garlic has silvery, white skins and is composed of many small cloves. They also have a nice sturdy neck that is easily braided. The flavor of Silverskins is usually stronger than Artichokes. 'Nootka Rose' and 'Rose du var' are both full-bodied Silverskins.
So-called 'Elephant Garlic' has become popular recently. It's called "elephant" because of its relatively large size. Very mild in flavor, it's great for diners who haven't quite warmed to the taste of garlic. Elephant garlic is not a true garlic at all, but a type of bulb-forming leek.
Which Part of Garlic Do You Plant?
Garlic is one of the easiest plants to grow. You plant the individual cloves within the bulb. Planting the largest cloves you have will result in larger bulbs. Plant each garlic clove two to three inches below the soil surface and about six inches apart.
A common novice dilemma is not knowing which end is up. Luckily, the answer is simple: it’s the pointed end. Your garlic will still grow, planted pointed side down, but the shoot will have to curve around you will wind up with a malformed bulb.
Topsets or Scapes
Whether to leave the topsets on or cut them off, is a matter of controversy. Most experts believe the scapes drain energy that would otherwise go into bulb development, resulting in a smaller yield. Cutting them off as soon as the stalks begin to curl would redirect the energy downward. Other garlic growers feel allowing the scapes to remain until they turn woody results in a better-storing bulb. A compromise is to cut the topsets while they are young and use them in cooking.
When to Plant
Fall is garlic planting time. Depending on where you are gardening, this could be from September to November. Once the soil temperature has cooled off to about 60 degrees Fahrenheit, the roots of the garlic clove will start to germinate and begin to take hold and anchor the plant. This is especially important in Northern climates where the ground freezes. Without sufficient time to grow good roots, the garlic plants will heave out of the ground. A three to four-inch layer of mulch applied after the ground freezes will also help prevent heaving. Straw is the mulch of choice because it’s cheap and easy to remove.
Dig, don't pull the garlic out of the ground. You may have planted a small clove, but the bulb is now several inches deep with a strong root system.
When to harvest garlic is a judgment call, but a good sign that it’s ready to go is when the lower leaves start to brown. About the only way to be sure is to ready is to dig a few bulbs and slice them in half. If the cloves fill out the skins, it’s time.
Harvesting too soon will result in smaller cloves that don’t store well. Leave the bulbs in the ground too long and the cloves may be bursting out of their skins, making them unable to be stored.
If you are experimenting with several varieties, Artichokes mature first, then Rocamboles, Purple Stripes, Porcelains, and finally Silverskins
Brush off any soil clinging to the bulbs. Allow the bulbs to cure or dry for three to four weeks in either a well-ventilated room or a dry, shady spot outside. Once the tops and roots have dried they can be cut off. You can also further clean the bulbs by removing the outer skins. Just be careful not to expose any of the cloves.
Garlic likes to be stored in cool temperatures, as low as 32 degrees Fahrenheit. The softneck varieties may last up to eight months. Hardnecks should be used soon after harvesting. Hardneck varieties may dry out, sprout, or go soft within two to four months. Keeping hardnecks at 32 degrees Fahrenheit sometimes helps them last for up to seven months without deteriorating.
Itakura, Y., et al. "How to distinguish garlic from the other Allium vegetables." The Journal of nutrition 131.3 (2001): 963S-967S.
Garlic Production for the Gardener. University of Georgia Extension