Poisonous plants in the yard

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There was a black plastic tarp laying over the ground in the backyard. I picked it up and under it were these white things and a very large broad leaf.

Seems these are calli lilys and they are poisonous to cats, dogs and people.

I don't know how these got there and if there will be more to be found but those things creeped me out so bad!

I dug them up and poured some cleaning vinegar over the area where they were.

Will they come back again?

There are so many poisonous plants where I live as it is a semi-deciduous rain forest in this part of America in the pacific northwest of California.

I hired a new landscape company yesterday and they are going to work on getting my yard full of weeds in order.

I seriously hope this works out as I'm at my wits end!

Any advice on how to deal with poisonous plants on your property?

Please advise if you do!

Thank you.