Phloem sap can flow d. both ways between production and storage sites.
Mostly dissolved in water, carbohydrates, hormones, and minerals make up phloem sap. It moves from the place where carbs are made or stored (the sugar source) to the place where they are utilized (sugar sinks).
Although several theories have been put forth, the pressure flow hypothesis suggests a mechanism for the movement of phloem sap. It is believed that vascular plants' phloem sap contributes to the transmission of informational impulses.
Even though phloem sap is "nutrient-rich relative to many other plant products and typically lacking in poisons and feeding deterrents, [yet] it is taken as the major or exclusive diet by a fairly narrow range of animals."
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