Salinity is the main factor limiting crop development and yield due to the physiological stress produced by salts. In this context, silicon (Si) has been proposed by several authors as an alternative to mitigate salt stress. Si supplementation is considered one of the promising methods to improve plant resilience and thus increase the tolerance capacity of several horticultural crops. In the present study, we describe how Si confers tolerance to salt stress and boron (B) toxicity by conferring physiological, biochemical, and molecular responses to plants that enable them to survive environmental adversities. In this sense, an important future challenge is to improve horticultural production, where Si can be included in crop management in order to obtain more resilient systems in the face of these unfavorable conditions that often reduce production.