40 Garlic Bulbs from Solent Wight Planted Through a Mypex Weed Membrane

The Mypex sheet was marked into a 15 cm grid before the first slit was cut. Solent Wight is a softneck garlic, so it forms no central flowering stalk, carries 10 to 15 cloves per bulb, and can store into the following spring when the curing is done properly. Through-membrane planting sends each clove into a narrow cut made with a Stanley knife; the payoff appears later in the hours of hand-weeding that never have to happen.

A 15 cm spacing in both directions gives each plant enough room to bulb without neighbouring leaves shading the base. On a roughly 1.2 metre by 1.5 metre bed, that grid gives 40 planting points. Each cut was kept just wide enough for one clove, planted pointed end up, at about 5 cm deep so the tip sits 2 to 3 cm under the soil surface.

What the black weave does through winter

Black woven polypropylene membrane, sold as Mypex and under generic names, blocks light from the soil surface while water and air still pass through the weave. Garlic occupies the ground from October until the following June or July, the longest stay of any common allotment crop. In an uncovered bed, that means eight or nine months of weeding around shoots that are easy to loosen by accident.

Annual weeds are suppressed completely under the membrane, and perennial weeds are weakened when they cannot reach light. The black weave also absorbs winter sun and warms the surface slightly on bright days. That small lift helps root development during the cool establishment period before top growth speeds up in March.

Moisture is the trade. The membrane holds dampness near the surface, and in a wet autumn the soil beneath it can stay saturated longer than open ground. Garlic rots in waterlogged conditions. On heavy clay, the bed needs to be raised or the membrane lifted during the wettest weeks. On free-draining sandy loam, closer to the conditions used by Isle of Wight growers, the same moisture retention becomes useful in a dry spring.

Only the harvest shows how that balance worked on the actual bed. If the black cover has helped more than it hindered, the lifted bulbs come out firm and wrapped in sound skins. If wet soil dominated, the base tells the story first.

Seed bulbs and clove selection

One Solent Wight bulb normally divides into 10 to 15 usable cloves, so a 40-point grid comes from three to four seed bulbs. The outer cloves are the largest and give the strongest chance of producing the biggest bulbs at harvest. Small inner cloves are better kept for the kitchen, because a weak clove uses the same grid space and usually grows into a small bulb.

Harvest and curing

Harvest starts when the lower third of the leaves have yellowed and the necks begin to soften. For garlic planted in October, that usually falls from late June into July. Delay narrows the storage life, because bulbs lifted too late split their wrapper skins.

Curing garlic follows the same principle as curing onion sets. The bulbs need air movement, shade, and low humidity for two to three weeks, long enough for the outer skins to dry to paper and the neck to seal.

A wire mesh rack in an open shed works, as do bunches tied and hung under cover. Direct sun can scald bulbs, and heat above roughly 30 degrees Celsius can trigger sprouting. A bright airy porch is a safer curing spot than a greenhouse.

When the necks are fully dry and the roots have shrivelled into brittle threads, softneck garlic can be braided and stored in a cool dry place at around 10 degrees Celsius. Solent Wight is bred to hold from July through to the following March or April, which is the reason it deserves bed space ahead of faster-fading varieties.

Rotation, neighbours, and the soil left behind

Garlic is an allium, and its long stay in the bed affects the crop plan after harvest. Following it with onions or leeks in the same season removes the rotation gap needed to reduce the risk of white rot building up in the soil. A three-to-four-year gap is the safer rotation target, so the membrane bed effectively becomes an allium station in the plan for the following year.

Carrots are a poor neighbour for another reason. Carrot root fly is attracted by the scent of bruised carrot foliage. Some growers say allium scent masks it, but evidence for garlic as a companion deterrent is thin.

A 60 cm barrier of Enviromesh or fine insect netting around the carrot bed does the measurable work. The fly is a weak flier and struggles above that height. Garlic interplanting leaves the carrot crop exposed if it is used as the main defence.

The soil after garlic is still useful. For nine months it has been covered, undisturbed, and largely weed-free. Salad leaves or a green manure can follow quickly through the cleared slits.

Once the bulbs are lifted, peeling the membrane back usually reveals soil that needs no clearing. A light fork and a top-dressing of compost prepare it for the next sowing.

Feeding without soft late growth

Garlic needs fertility at the start, then restraint later. Heavy nitrogen late in the season encourages soft leaf growth, reducing bulb size and shortening storage life. The bed was prepared before planting with two buckets of well-rotted manure or garden compost forked into the top 20 cm, giving a slow background feed through the establishment months.

The main nitrogen push belongs in early spring, around March, when the plants break dormancy and make rapid top growth. Sulphate of ammonia or a liquid feed watered through the membrane at that point helps build the leaf canopy that will later fuel bulb swelling. Feeding stops after early May, because nitrogen taken up in the final weeks softens the neck and cuts shelf life. Bulbs that finish hard and lean in their last month cure faster and braid more tightly.

Forty plants at a realistic average bulb weight of 80 grams give around 3.2 kg of cured garlic. That return comes from three or four seed bulbs and a two metre offcut of Mypex that can last for several seasons. The crop asks for almost no weeding once the cloves are planted, although the membrane shifts attention to drainage and winter wet. One detail remains outside the planting record: how many covered slits turn into bulbs that are firm at the base.