The Empress's Growth

You draw the sigil of the empress in the air and ask for her blessing. You channel astral energy into the ground and 2 thorn spitting plants sprout within 60 ft of you. Once summoned you can use a bonus action to command the plants to fire thorns at a creature you can see until the spell ends. Make a spell attack roll against the creature. On hit deal 1d4 piercing and 1d6 poison damage, and the creature must make a CON save against your spell save DC or be poisoned for 1 minute. Summon 1 extra plant for each level cast above 3rd level.