Miracle fruit

About Miracle fruit

Miracle fruit is a slow-growing evergreen shrub from West Africa with small, bright red berries. A protein in the pulp, miraculin, makes sour foods taste sweet for about 15 minutes to an hour after you eat a berry. It needs acidic soil, so most U.S. gardeners grow it in a pot that can come indoors in cold weather.

UF/IFAS says it is not frost tolerant and recommends pots in Florida so plants can come inside before a freeze; a Palm Beach County Extension agent notes older plants can live through the mid-20s F with leaf and twig loss. No source gives zones, so the range is our estimate. The Hawaii-Pacific Weed Risk Assessment rates it low risk, and UF/IFAS expects little invasive potential.

When to plant

Timing is counted from your average last spring frost (and first fall frost). Sow & Tell works out the actual dates for your ZIP code.

Plants start fruiting in their third or fourth year and peak around year five (UF/IFAS; Palm Beach County Extension). Fresh seed sprouts in about 8-10 weeks and must never dry out; cuttings root slowly. In-ground plantings in south Florida are spaced about 8 ft apart (UF/IFAS). No source ties planting to a frost date.

Soil

Rich, well-drained, acidic soil, ideally around pH 5; in alkaline areas grow it in a pot of pine-bark or peat-rich mix (UF/IFAS; Palm Beach County Extension).

Use an acidic mix, such as a pine-based potting mix or one with plenty of peat moss; avoid alkaline soil (UF/IFAS; Palm Beach County Extension).

Feeding

• Regularly through the warm months: Slow-release fertilizer such as 18-6-8, or a balanced fertilizer. Follow the label; a Palm Beach County Extension agent suggests a balanced feeding every two to three months (UF/IFAS; Palm Beach County Extension).

Don't let it dry out in the dry season, and don't grow it in alkaline soil (UF/IFAS).

Harvest

Berries come all year in flushes, about every two months. Pick weekly when the whole berry, including the shoulder, is fully red (UF/IFAS).

Potted plants in south Florida gave about six flushes of berries a year, roughly every two months; pick weekly and prune once a year to keep fruit within reach.

Varieties (9)

There are no released cultivars; UF/IFAS describes 9 plant forms (morphotypes) from its south Florida yield trial.

Pests to watch for

Mealybugs, Twospotted spider mite

In the kitchen

Eat a berry, let the pulp coat your tongue, then try lemons, limes, sour berries or other tart foods; they'll taste sweet for a while. The effect fades with cooking, so extra fruit is frozen or freeze-dried (UF/IFAS).

Keeping it: Fresh berries don't keep long; freeze or freeze-dry extras, which keeps the sour-to-sweet effect.

Safety: The fruit is sold in the U.S. as a natural product, but the FDA has not accepted miraculin as a food additive; early GRAS requests in the 1970s were denied for lack of safety data (UF/IFAS). Claims about blood sugar or chemotherapy taste changes come from small or non-human studies, so don't use it as a treatment. We found no research-based guidance on pregnancy, drug interactions or allergies.

Pets: Not listed by the ASPCA