From small things, God often makes great remedies. In doing so, He reveals His power, wisdom, and mercy toward humankind. Just as fragile glass lenses restore the failing sight of the elderly, and humble herbs from the fields become medicines and antidotes for deep-rooted illnesses, so too can bitter substances be transformed into healing cures. From something as coarse and bitter as the lupin plant, God fashioned a remedy to restore the weakened and exhausted soils of São Miguel.

These lands, once fertile, had grown tired and unproductive. Yet through this unlikely means—the lupin—they regained their strength. As if wearing spectacles, the soil could once again “see” its own fertility. As if treated with a bitter medicine, it recovered from its frailty and sterility, becoming rich and productive once more.

A Practical Discovery

In the mid-16th century, a man named Barão Fernandes, living near Grota de João Bom, was among the first to experiment with sowing lupins. Initially, he planted them along the edges of wheat fields without fully understanding their potential.

Later, another man from mainland Portugal, Lopo Pessoa, observed that land planted with lupins yielded stronger and better wheat the following year. This insight led to the gradual adoption of the practice across the island.

How Lupins Revived the Soil

Farmers began to “lupinize” their fields—sowing lupins to restore soil health. The results were striking. Previously exhausted lands became fertile again, producing abundant harvests.

Several explanations were proposed:

• Natural fertilization: Lupins, when plowed back into the soil, decompose and enrich it with organic matter.
• Protective cover: Their dense foliage shields the soil from harsh weather, preserving moisture and structure.
• Soil cleansing: Lupins absorb the “coarser” and less fertile elements of the soil, leaving it more balanced and productive.

More Than Just a Crop

The lupin plant is vigorous, with tall stems and abundant leaves. Its seeds, although naturally bitter, can be made edible through soaking and boiling, becoming a popular and satisfying food.

Interestingly, the plant follows the sun throughout the day—its leaves and stems turning from east to west in a natural rhythm.

Beyond restoring the soil, lupins offered additional value:

• Their seeds could be sold or consumed.
• Their dried stalks served as fuel.
• Fields treated with lupins yielded more reliable and abundant crops in subsequent seasons.

The “Outonar” Method

Another technique, known as outonar, involved sowing lupins in autumn and plowing them into the soil before full maturity. This method acted as a form of green manure, enriching the land for up to two years without further treatment.

Fields treated this way were visibly more productive than those left fallow, often requiring less maintenance and yielding better harvests.

Caution and Balance

Over time, some farmers became cautious. There were reports that excessive use of lupins might contribute to pests or issues affecting wheat crops. Like many remedies, its effectiveness depended on balanced use.

A Curious Contrast

While lupins greatly benefited the soils of São Miguel—likely due to their ability to absorb excess salinity—they were said to have the opposite effect in mainland Portugal. There, without the same soil conditions, they could deplete rather than restore fertility.

A Lesson from the Land

This story highlights a timeless truth: even the most humble and overlooked elements can hold transformative power. Through careful observation and practical wisdom, the farmers of São Miguel turned a bitter plant into a vital tool for agricultural renewal.