Genovese Basil

Genovese Basil is the celebrated sweet basil of northern Italy and the true variety behind authentic pesto alla Genovese. It is prized for its large, broad, slightly cupped leaves in a glossy deep green, and for a warm, sweet aroma with gentle clove and anise notes that is fuller and rounder than ordinary basil. Its tender, low-bitterness leaves make it the first choice for fresh sauces, salads, tomato dishes and infused oils, while its lush, bushy habit also looks handsome in pots on a sunny balcony.

Planting

This is a warm-season annual that cannot tolerate frost, so timing matters. You can start seed indoors about 6 to 8 weeks before the last spring frost, or sow and transplant outdoors only once all danger of frost has passed and the soil has warmed; wait until nighttime temperatures stay reliably above 10 C before moving plants outside. Sow the seed about 0.6 cm deep. Germination usually takes around 5 to 10 days, and is best when the soil or media holds a temperature of roughly 18 to 21 C, with strong results around 20 C. Give plants a full-sun spot with at least 6 to 8 hours of bright light each day; they will accept part sun but truly thrive in a warm, sheltered, sunny site. Thin or transplant seedlings to their final spacing once they have grown 2 to 3 pairs of true leaves, aiming for roughly 15 to 30 cm between full-size plants, or a tighter 10 to 20 cm if you are growing mainly for cut leaves; direct-sown rows sit about 45 cm apart. Indoor-started seedlings usually move outside about 6 weeks after sowing, once frost has passed. In Egypt the main challenge is cold nights below about 10 C rather than summer heat: in the Nile Delta and Lower Egypt, start seed under protection or in a seedbed in late January to February and transplant out in March to April once nights are dependably above 10 C, for a long cutting season from June through October; avoid sowing into the cold of mid-winter. In the milder winters of Upper Egypt the frost-free window is wider, so transplanting can begin a little earlier, from late February into March, and a second autumn crop is possible. Because germination peaks at 18 to 21 C, the Egyptian spring naturally meets the ideal, while the peak summer months become the main harvest period.

Fertilizing

Genovese Basil responds to a light, balanced feeding approach. Work a low-nitrogen starter fertilizer into the soil before planting, such as a 5-10-5 blend at about 3 ounces per 10 feet of row, or a 5-10-10 blend at around 3 lb per 100 square feet. If growth slows roughly two months after planting, side-dress with about 0.1 to 0.2 kg of calcium nitrate per row section to give a nitrogen boost. For plants in pots, use a diluted balanced liquid feed every 3 to 6 weeks. Keep in mind that basil grown in the ground in good soil often needs no added fertilizer at all; container plants benefit most from an organic-based balanced liquid feed, and it is best to avoid high-potassium feeds.

Care

Steady moisture is the key to tender, flavourful leaves, as basil is not drought tolerant and wants a fairly constant supply of soil moisture. Water deeply about every 7 to 10 days, more often for containers, and keep the soil evenly moist. Water at the base of the plant in the morning and try not to wet the foliage, which helps limit disease. Pinch the terminal shoot tips regularly, at least once a week, to encourage a bushy, leafy plant. Watch for the common diseases of basil, including downy mildew that shows as fluffy growth on leaf undersides, Fusarium wilt, gray mould, bacterial leaf spot, and damping-off or root rots, along with pests such as aphids, slugs and snails, spider mites, whiteflies, Japanese beetles and leafhoppers; watering at the base rather than over the leaves is one of the best ways to keep downy mildew at bay. Begin harvesting young leaves as needed, and for the best flavour pick just before flowering while pinching out flower buds as they appear. Plants usually start to flower in mid to late summer, and once they flower they turn woody and the leaves grow more bitter with lower yield, so remove flower stems to keep the foliage at its best. For a full cut, take the plant back to about 10 to 15 cm above the ground to spur fresh regrowth, and harvest in the cool of the early morning.