I am VERY excited about this thread... Now We are getting to the nut-cutting. First topic, Mulberry Trees. Like fig Trees, people don't like them because they attract bees, bugs, etc. The glass is 'half empty' line of thought. The half full thought is that the tree keeps pest away from the prized plants. Zinnias, (them pretty little flowers) are also used to attract pest, to keep them out of the garden. Seamaiden, maybe you could plant one in a container on the deck, or nearby. The berries are very good to eat, but most times are infested with worms, so beware. They are considered trash trees, too much trouble in the perfect world. People that have them would be glad to have somebody dig up a few baby plants growing around the base of the Mother tree.
As far as perennials goes, B Willy, here is my belief. My first Vegetable garden was in 68, at 8 years old. My passion & main hobby is growing ANYTHING. First pot high, 11 years old, quit in 1980. Started seriously growing & learning in Oct. 06. Rejuve, cloning, all that exciting stuff. I started broad-casting seeds about 10 years ago, vegetable seeds. They are cheap. 1000 Mustard seeds may cost .50 cents. Throw them out in a good spot, walk away. Same goes with pot seeds. Pot has been growing wild for only about 2,000 years. They mutate, evolve, adapt to the local environment, depending on the soil, weather, pest & strain. Only the strong survive. To expound upon what B Willy is saying, which he is correct, is my theory, due to all the information that we have access to, is that any "Land-Race" strain that basically fits the same living environment from where it thrived for 1,000's of years will thrive in your local if there is a basic match. The Sativa does well in Mexico, the Indica thrived well in other parts of the world. The Equator is the mirror image environment. If I'm 2,000 miles North of the Equator, then any & all land race strains 2,000 miles South should feel at home in my back yard, if the elevation & rain fall is close. We can control watering, PH, nutes, with just a shake of this & that from bags of stuff. I am not in a position to start my "Forever" plot yet, but when I get to that point, among the things I have mentioned, I am going to research building the perfect planting bed for growing asparagus. The soil conditions between the two, to me, is the perfect route to take. I have to tell you people about the growing addiction that I have. Sneaking popcorn out of the house to plant is nothing. Buying 15 bean soup packages at the store & planting rows of them is fucking awesome! The Color, the variety is amazing. My Friends dubbed it as the "PSYCHO Row". Sorry about the long writ, I just get excited about my passion. PS; When starting the "forever" plot, the rule of tell no one multiplies by 100.
My folks have a lovely fruitless mulberry. It does drop leaves, but they're very big and NOTHING like f'ing pine needles. 
