Tomatillo

Self-incompatibility in tomatillo means pollen from the same plant is rejected, so fruit set requires a second, genetically distinct plant and an insect to move pollen between them. A gardener who plants one tomatillo gets flowers and no fruit, and the reason is genetic rather than nutritional.

Because cross-pollination is obligatory, bee activity during flowering translates directly into yield in a way it does not for a self-fertile tomato. Protected cultivation therefore needs introduced pollinators or hand pollination, which is a real cost that tomato does not carry.

Fertilizer rates, timing, and forms should follow local soil tests and regional guidance. AgricultureID does not publish universal fertilizer recommendations.

The inflated calyx grows ahead of the fruit and is then filled as the fruit expands. A fruit picked before it has filled the husk is immature; one left after the husk splits and dries begins to lose quality on the ground. Colour is a poor guide because most cultivars are harvested green.

Unlike tomato, tomatillo is used at a green, firm, acidic stage, and its tartness is the point of the crop. Ripening to yellow reduces the acidity that green sauces depend on, so a crop left to colour has been left too long for its market.

Soil suitability should be assessed with local soil survey information and, where available, field testing.

The plant branches widely and is often grown unstaked on the ground, which is simpler but leaves fruit in contact with soil and increases losses. Staking or caging raises quality and picking speed and is the usual choice in commercial production.

Tomatillo shares its family with potato, tomato, pepper and eggplant, and it hosts the same soil-borne diseases and several of the same viruses. It cannot be rotated against them, and its inclusion in a vegetable rotation is a family decision rather than a crop decision.

Management combines resistant varieties, rotation, monitoring, and — where justified — locally authorized control products applied according to their labels.

Physalis philadelphica is a different species from Physalis peruviana, the cape gooseberry, which is a sweet fruit eaten ripe. Both are husk-bearing Physalis and the common names overlap in some markets, but they are different crops with different uses.

The crop tolerates dry conditions better than tomato but responds to irregular supply by cracking the fruit inside the husk, where the damage is invisible until the husk is removed. Steady moisture through fruiting is a quality input.

Fruit left in the field seeds freely and tomatillo volunteers persistently in following crops, which is a weed problem in rotations and a source of virus carry-over. Removing unharvested fruit is a management step and not merely tidiness.