It can always replicate what it has copied before, even if that copy is destroyed. For example, it can recreate copies of slaves if they die. All it will need is energy.
As long as it has energy, it will be able to recreate copies. To others, this will look like those slaves were resurrected.
Unfortunately, this seed lacks the core that makes Yggdrasil special. If he wants it to be capable of enslaving others, he will have to find an ability that can enslave others and fuse it with the seed.
But that doesn't mean the seed is useless for what he wants to do. He doesn't actually need to enslave Wrath. He will be more than content if the seed can replace Wrath completely.
For the seed to grow, it needs something powerful to replicate. The stronger the object, the better.