Zyra Plant's Are Not benefitting by Gunblade's new passive

If you buy Gunblade on Zyra, None of your plants provide the 15% leech on their auto attacks. Even though Gunblade applies to Heimer Turrets and other additional effects.

> UNIQUE – OMNIVORE: Instantly heal for 15% of all damage dealt, including physical, magical and true damage. Area of effect damage only heals 5% for every unit affected.