Landscaping Block Library

I'm a landscape architecture student that is looking for ways to speed up productivity but I want to make sure that I'm doing things the right way. I'm working on creating a library of blocks of different categories(trees, shrubs, cars, people, etc) that I can setup in a separate autocad file. From there, I want to be able to use the Design Center or create tool palettes to easily insert my symbols.

I mostly work in Decimal Feet. I want to create my tree/plant blocks where the diameter=1 unit, so I can scale my plants based on the actual diameter of the trees.

I'm collecting different blocks from around the internet and organizing them into a single file. The problem is that they are all different units. When I try to insert symbols from the Design Center, I cannot get them to scale correctly. Most are already scaled to equal 1 unit but some are "radius=1 unit" and others are "diameter=1unit". Of course, I want to make everything consistent to "diameter=1 unit".

In my library base file, what do I need to set my units to?

When creating a block, what do I need to set my block units to?

Any other tips for creating a plant block library?

Hopefully that wasn't too confusing. Thanks for the help!

Read up on

INSUNITS (Specifies a drawing-units value for automatic scaling of blocks, images, or xrefs when inserted or attached to a drawing).

INSUNITSDEFSOURCE (Sets source content units value when INSUNITS is set to 0).

INSUNITSDEFTARGET (Sets target drawing units value when INSUNITS is set to 0).

See if the info in this link helps.

Scaling of Blocks

Thanks very much for that info. I got it to work and I'm sure that command will come in handy in the future.

Maybe I'm making things more difficult than I should but I think I would like to set all my blocks in the source file to "Feet". That way I wouldn't have to set Insunits for each new drawing that I setup. I know it's not a big deal to set Insunits for each new drawing but I want to make it completely fool proof for myself and basically make it flow without having to think, haha. I'd like my source file "ready to go".

Is there a way to change the variable of multiple "block units" at once? The only way I have found to do this is individually by using the block editor. With multiple blocks, this can end up being pretty time consuming.