I have two large containers I purchased last summer. I want to put soil inside and plant a lot of seeds, different kinds, then later transplant them as to where I want to plant them inside those containers and elsewhere. I was wondering should I put holes in the bottom and how many holes? Oh, and it sits on concrete.

One is 22.5", a whiskey resin barrel, as shown in picture. The other one is a bit smaller.

I am planning on buying one more similar to those. I was going to start the seeds inside, however we will be gone the middle of April for a week and it will interfere with starting them indoors, so decided I will do it after the last frost sometime in May, hopefully sooner than later :)

I also have a regular flower bed where I can plant those seedlings but many of them will be in those containers. I am planting zinnia, petunias, lavender, and maybe others.