Garlic will adversely affect members of the legume family (peas and beans) and also Asparagus.
In climates with long growing seasons, peppers and tomatoes also are good candidates for planting after garlic or onions. In cooler climates, Chinese cabbage or bok choy may be the perfect choice.
One of the few downsides to growing garlic in the garden is that it will build up sulfur in the soil, which can inhibit the growth of certain plants. Garlic will stunt the growth of beans, peas, and most legumes, and should be planted further away to prevent reduced growth.
What to Plant After Garlic. Since garlic prefers a cold growth season, summer crops, such as carrots and spinach, will grow after it. You can also plant aubergines and peppers after it. Carrots, tomatoes, and potatoes can also be planted after garlic as it acts as a natural pest-repellant to these crops.
To avoid disease problems, don't plant garlic in the same spot two years running. Prepare several shallow furrows in the soil that are 6 inches apart.
In your garden, you might fill openings in strawberry beds with garlic, or to plant garlic in a widely spaced double row, with strawberries in the middle. Depending on your climate, you might plant the garlic now, mulch over the bed through winter, and add the strawberries in early spring.
Garlic substrate could influence plant growth through affecting soil microbiome structure. The relationship mechanism between changes in soil microbial communities, disease suppression and plant development, however, remains unclear, particularly in the degraded soil micro-ecological environment.
At the end of September, I planted my garlic cloves on the top of the row beds. It is the cover crop I plant ahead of garlic to reduce the competition from winter annual weeds and to provide a protective winter mulch.
Tomatoes. A nightshade like the aforementioned peppers, tomatoes benefit from growing near garlic, too. The odiferous bulbs can help to keep spider mites away from tomato plants.
Growing garlic from seed can be tricky, as it's nearly impossible to get your hands on “true garlic seed.” You can, however, grow garlic from top-setting bulbils, which behave like seeds (though they're not in a technical sense).
Crop Rotation and Location
It is a good idea to practice rotation when planting garlic. Don't plant garlic where onions or a member of the onion family has been grown previously. Plant garlic in full sun and in a well-drained bed with organic matter worked into it.
Garlic has a better survival rate when mulch is applied. Mulch insulates and prevents the freezing/thawing action which can heave cloves out of the ground. If snow cover can be assured, that can be adequate mulch, but we would still recommend mulch to protect the garlic.
Bugs simply don't like the smell of garlic. Plant garlic in fall around fruit trees and shrubs to help deter borers and other insect damage. Did you know that planting garlic can keep damaging insects away from your garden?
What happens if you leave garlic in the ground too long? In mild climates, garlic left in the ground for too long will resprout and grow again. Underground, the bulbs will start to split. You can still eat this garlic, but it won't store as long.
In addition, garlic is a heavy feeder which means it likes lots of nutrients such as nitrogen, phosphorus and potassium. Adding organic matter for your crop to enjoy will give you the biggest and best tasting garlic. It will also supply most of the nutrients you need to grow great garlic.
The pungent taste of garlic (Allium sativum) makes it a go-to food in the kitchen. Many garden insects will avoid garlic, however. It can be sprayed on plants as a repellant and also grown with plants that often attract insects like aphids to keep them away.
Garlic can act as a “barrier plant” against aphids. Plant garlic between the rows of your lettuce crop to deter aphids from getting to your lettuce leaves.
Benefits of Growing Garlic and Roses Together
Besides helping to keep aphids away, and fungal diseases away, garlic is said to increase the fragrance of roses, according to The Herb Society of America. That might sound counterintuitive because garlic is known for its strong scent but it's worth a try!
Garlic is great to grow alongside members of the Brassica family, like kale, kohlrabi, cabbage, and cauliflower. Garlic helps to repel cabbage loopers, cabbage maggots, cabbage worms, and Japanese beetles from vulnerable crops.
When you plant garlic, you plant individual cloves, but since these were never separated they'll come up as dense patches of garlic shoots. After two or three years, a single garlic clove will have dozens of garlic shoots sprouting from a small patch of ground.
What happens if you plant a whole garlic bulb? If you plant a whole garlic bulb instead of separating the head into its individual cloves and planting each separately, the plants will not have room to develop properly. The result is likely to be very small garlic plants that fail to mature into multiple cloves.
Too close, garlic plants will compete with each other, to their detriment. Their roots compete for the same, finite nutrients. Leaves overlap, competing for sunlight.
Garlic Crop Rotation
Garlic and onions should follow brassicas, and be followed by potatoes. In a 4 crop rotation system garlic is only in the same bed every 4 years. This will keep soil bound pests and diseases at a minimum and improve the health of all crops.