Owner, Paolo Arrigo, will speak at Camden Garden Centre on seed to plate on 3 March and 9 June and at Finchley Garden Centre on 11 June.
The company will also be at Chelsea Flower Show (May 24-28).
New seed varieties in Franchi's new catalogue include Tomato Black Crimea 'Noire de Crimee'.
The catalogue now incluides more regional artisan producers, with seeds at one end and food and gifts at the other. These include Montalbano olive oil, a £980 'Pizzone' pizza oven and a £2,250 Seeds of Italy Pizza Trike complete with mobile pizzeria oven.