From Druid vs. Necro Rulesheet
Life springs up in the footsteps of the Druid.Each Deployment Phase, the Druid may place a new Vine
marker in her zone. Or, she may instead place that marker in a zone, or adjacent to a zone, containing a Vine marker she controls. The Druid, and her familiars and tree spawnpoints, can use her Vine markers to
extend the range of vine spells they cast.
From the Codex
Vine markers are a Living conjuration with 1 life, no armor, and they cannot gain armor. Vine markers hinder enemy non-Flying creatures. Any amount of damage will destroy a Vine Marker, regardless of its total life. They can’t be targeted by ranged attacks. Any number of Vine markers can occupy a zone. As the Druid, or a familiar or tree spawnpoint she controls, casts a vine spell, you can destroy a target Vine marker she controls as an additional cost to cast that spell. If you do, you may ignore the range of that spell to target that Vine marker’s zone, an object in that Vine marker’s zone, or a border of that Vine marker’s zone. That vine spell must have a legal target.
When you use deployment you are not targeting, thus LoS is not required when Deploying from the Vine Tree. LoS is required if the Druid were to cast a spell and target a vine marker.