If you're looking for a practical add-on for tomato, Flower is an option worth considering on Amazon.

People who keep tomato indoors or on a terrace often weigh items in the vein of Flower.

One detail worth noting is: Sustrato Huerto Urbano 20 L Enriquecido con Guano y Materia Orgánica Crecimiento y Desarrollo de Cultivos en Espacios Reducidos.

Compare Flower with similar alternatives and decide based on your experience with tomato.