How to Plant Garlic Bulbils – For a Perpetual Harvest
To plant garlic bulbils, sow them in the fall about 1 inch deep and 2 to 4 inches apart in well-draining, sandy loam soil. Unlike cloves, bulbils take two to three years to reach full size, producing a non-cloven “round” in the first season.
This method is a cost-effective way to grow thousands of disease-free garlic plants from the small clones found in the scape’s umbel.
Most gardeners are familiar with planting garlic cloves to get a summer harvest. However, there is a secret way to multiply your crop exponentially without buying new seed stock every year. Learning how to plant garlic bulbils is a game-changer for anyone looking to scale up their home garden or small farm.
Bulbils are tiny, genetically identical clones of the parent plant that grow in the “flower” head of hardneck garlic. While they require more patience than traditional cloves, they offer a clean, disease-free start for your soil. You can turn a handful of scapes into a massive field of garlic over just a few seasons.
In this guide, I will walk you through the entire lifecycle of a bulbil. We will cover soil preparation, the multi-year growth cycle, and the specific techniques needed to ensure success. Whether you are a weekend hobbyist or a budding landscaper, these steps will help you master this unique form of vegetative propagation.
Understanding the Biology of Garlic Bulbils
Before you get your hands dirty, you need to know what you are actually planting. Bulbils are not seeds; they are small bulbs produced by the Allium sativum var. ophioscorodon (hardneck garlic) plant. They grow inside a pod called an umbel at the top of a curly stalk known as a scape.
Because bulbils never touch the ground while growing on the parent plant, they are often free from soil-borne diseases. This makes them an excellent choice for revitalizing a garden that has struggled with pests or fungal issues. You can even find similar techniques when learning how to plant elephant garlic bulbils, though true garlic bulbils are much smaller.
The size of these tiny clones varies by cultivar. Some varieties, like ‘Porcelain’ garlic, produce hundreds of grain-sized bulbils. Others, like ‘Rocambole’, produce fewer but much larger bulbils, sometimes the size of a marble. Larger ones usually reach maturity faster than the smaller ones.
The Role of Vernalization
Garlic requires a period of cold to trigger the growth of a bulb, a process called vernalization. This is why we typically plant in the fall. Without this cold snap, your bulbils may simply grow green leaves without ever forming a “round” or a divided bulb. If you live in a warm climate, you may need to refrigerate your bulbils for several weeks before planting.
Preparation: Soil and Timing
Success starts with the ground. Garlic bulbils are small and lack the energy reserves of a large clove. They need the perfect environment to push through the soil surface and establish roots before the ground freezes.
The best soil for garlic is a sandy loam rich in organic matter. It must have excellent soil drainage. If the area stays soggy during the winter, your tiny bulbils will rot before spring arrives. I always recommend testing your soil pH; garlic thrives in a range between 6.0 and 7.0.
If you are used to planting garlic sets, you know that timing is everything. Aim to plant about 4 to 6 weeks before the first hard frost. This gives the bulbils enough time to grow roots without sending up too much top growth that could be damaged by extreme cold.
Amending the Soil
Prepare your planting bed by mixing in well-rotted compost or a balanced organic fertilizer. Look for an NPK ratio like 5-10-10 or 10-10-10. Avoid high-nitrogen fertilizers late in the season, as you want to encourage root development rather than lush foliage. Turn the soil to a depth of at least 6 inches to ensure it is loose and airy.
How to Plant Garlic Bulbils
Now that your soil is ready, it is time to get them in the ground. Because bulbils are so small, you can plant them much more densely than you would with standard cloves. This allows you to grow hundreds of future bulbs in a very small “nursery” bed.
First, carefully remove the bulbils from the dried umbel. Be gentle to avoid bruising the delicate skin. Sort them by size if possible, as the larger ones will likely be more vigorous. Knowing how to plant garlic bulbils correctly involves paying close attention to depth; if you bury them too deep, they will struggle to emerge.
Follow these specific steps for the best results:
- Create Furrows: Use a garden trowel or your finger to make shallow rows about 6 inches apart.
- Placement: Space the bulbils 2 to 3 inches apart within the row. If they are very small (grain-sized), you can scatter them more like seeds.
- Planting Depth: Cover the bulbils with about 1 inch of soil. Larger bulbils can go slightly deeper, up to 1.5 inches.
- Firming: Lightly press the soil down to ensure good contact between the bulbil and the earth.
- Watering: Give the bed a gentle watering to settle the soil.
After planting, apply a thick layer of mulch. Straw or shredded leaves work best. This mulching protects the tiny plants from “heaving,” which happens when the ground freezes and thaws, pushing the bulbils out of the soil. Aim for a layer 3 to 4 inches thick.
The Multi-Year Journey to Harvest
Patience is the most important tool in this process. Unlike cloves, which give you a full bulb in one season, mastering how to plant garlic bulbils requires a long-term mindset. Most varieties follow a three-year cycle to reach full size.
Year One: The Round
In the first spring, your bulbils will send up thin, grass-like leaves. By mid-summer, the leaves will yellow and die back. When you dig them up, you won’t find a divided bulb. Instead, you will find a round—a single, solid onion-like bulb about the size of a marble or a grape.
Harvest these rounds, cure them for a few weeks in a shaded area, and then replant them in the fall. These rounds now have significantly more energy than the original tiny bulbils. They are essentially “super-cloves” ready for the next stage of growth.
Year Two and Three: The Transformation
In the second year, these rounds will often grow into a small, divided garlic bulb with 2 to 4 cloves. Some larger varieties might even jump straight to a medium-sized bulb. If you want the massive, supermarket-sized bulbs, you may need to repeat the harvest-and-replant process one more time.
By the third year, the plants should be indistinguishable from garlic grown from traditional cloves. The advantage is that you now have a massive amount of seed stock for almost zero cost. Once you understand how to plant garlic bulbils, you can essentially stop buying seed garlic forever.
Value Layer: Garlic Bulbil Growth Timeline
| Stage | Timeline | What to Expect |
|---|---|---|
| Initial Planting | October – November | Small bulbils sown 1″ deep in nursery beds. |
| First Harvest | July (Year 1) | Harvesting “rounds” (single solid bulbs). |
| Second Planting | October (Year 1) | Rounds replanted with wider spacing. |
| Final Harvest | July (Year 2 or 3) | Full-sized, multi-clove garlic bulbs. |
Managing Pests, Diseases, and Weeds
Even though bulbils start disease-free, they are still susceptible to garden pests. Keeping the bed clean is vital. Because bulbil foliage is so thin in the first year, weeds can quickly overwhelm them. Hand-weed carefully to avoid disturbing the shallow root systems.
Watch out for onion maggots and thrips. If you notice yellowing leaves or stunted growth before the mid-summer die-back, investigate the roots. For organic pest management, some gardeners use a garlic spray for pest control on surrounding plants to deter insects, though you should be careful not to over-apply it to the delicate bulbil greens.
Fungal issues like White Rot can persist in the soil for years. If you know your soil is contaminated, planting bulbils in raised beds with fresh soil is the best way to ensure a healthy crop. Always rotate your crops; never plant garlic in the same spot where onions, leeks, or chives grew in the previous three years.
Safety and Tool Maintenance
When working in the garden, always wear gloves to protect your skin from irritants and sharp tools. Ensure your trowels and hoes are sharp; clean cuts in the soil prevent unnecessary compaction. After the season, clean your tools with a 10% bleach solution to prevent spreading pathogens between different areas of your landscape.
Advanced Tips for Success
If you want to speed up the process, choose varieties known for producing large bulbils. ‘Rocambole’ and ‘Marbled Purple Stripe’ varieties are famous for this. The larger the starting material, the faster you get to the finished product.
Another “pro” tip is to leave the scapes on the parent plant until the umbel begins to crack open. This ensures the bulbils are fully mature and have the maximum amount of stored energy. If you cut the scapes too early to eat them, the bulbils won’t be viable for planting.
Knowing how to plant garlic bulbils also means knowing when to walk away. If you have a very harsh winter with no snow cover, you might lose some of the smaller ones to deep freezes. Always plant about 20% more than you think you need to account for natural losses.
FAQs About Growing Garlic Bulbils
Can I Plant Bulbils in the Spring?
While fall is best, you can plant them in early spring as soon as the soil can be worked. However, you must refrigerate them for several weeks beforehand to simulate winter. Spring-planted bulbils often produce smaller rounds than those planted in the fall.
Do I Need to Peel the Bulbils?
No, do not peel them. The papery skin protects the bulbil from rotting in the damp soil. Plant them exactly as they come out of the umbel head.
How Long Do Garlic Bulbils Last Before Planting?
If kept in a cool, dry, and dark place, they can last for several months. Do not store them in plastic bags, as they need airflow to prevent mold. A mesh bag or a paper envelope works perfectly.
Why Are My Bulbils Not Sprouting?
The most common reasons are planting too deep, poor soil drainage leading to rot, or a lack of cold treatment (vernalization). Ensure the soil stays moist but not soggy during the early spring growth phase.
Final Thoughts on Growing Your Own Garlic
Mastering the art of growing from bulbils is one of the most rewarding skills a gardener can acquire. It transforms garlic from a simple annual crop into a sustainable, long-term investment. By taking the time to learn the nuances of soil health, timing, and the multi-year growth cycle, you ensure a lifetime of pungent, flavorful harvests.
Remember that gardening is a marathon, not a sprint. The patience you show in year one will be rewarded with hundreds of massive bulbs in the years to follow. Grab some scapes, prepare your soil, and start your bulbil journey this season. Your kitchen—and your wallet—will thank you.
Taylor pairs an engineer's eye with years of hands-on work in soil, lawns and outdoor machinery. He tests ideas in his own garden, keeps tractors and mowers running himself, and speaks to local horticulture groups. Every Garden Aider guide is written to be practical, accurate and safe to follow.
“To bring life alive, you just need to mix some love with the compost, bedding, and gardening machines.”