I've planted 5 types of switchgrass to date over the years. My top 2 are Cave In Rock and Kanlow. Sunburst is an interesting newer one that so far, so good. These are 2 year old stands. 3rd year is generally fully mature. For sure 4th year. 4th year I will burn if needed. Not before then. Here's some summer pictures of them and also a pic I snapped last week. Second year, managed right, good growing years - IDEAL: 6-8' tall. Drought, mowed, weed issues but still thriving: 1-5' tall depending on situation. Switchgrass likes "high quality soils"- dark black soils but can grow on a wide variety of soils. Lower bottom land, switch is my "go-to". I have no switchgrass "monocultures" over about 10 acres. I like diversity & think it's best. A few fields or patches - all switch, great. I would not do it for every drop of my farm, IMO. SEED: February/March is ideal. DRILL OR frost seed. Can you seed later, different times, absolutely. I seed in February as seed coat is hard and needs break down from freezing & thawing. Not the case with fluffies. Seed higher rates if broadcast. I personally like seeing at a higher rate as I want it THICK and to dominate if I do Monoculture switchgrass areas. For example, drilling, I'll do 6-10 lbs CIR and 2-4 lbs of Kanlow (high rates for both will be incredibly thick and higher rate than recommended). CLEAN SEEDBED IS NEEDED FOR HERBICIDES!!!, cleaner the better. ATRAZINE!!!!!!!!!!!!!!!! Needs soil to attach to and the more the better. Legal limits for your location. I know 5 quarts to acre would be exceptional & IDEAL but most states only allow 2.2 quarts. This is due to corn farmers spraying thousands of acres bi-yearly. IMO - one time of atrazine on tiny bit of switchgrass established- non-issue BUT the law is what it is. BEST CASE: you come out of CUT BEANS, weed free..... Seed in February, March..... In april to may you spray Gly with heaviest amount of Atrazine you can.... If you don't have flush of weeds or able to spray one more time before germination of switch...... August you'll notice nice growth, September you could and I've seen it countless times - could have 5-6' tall switch (thinner, no doubt, young plant) with actual seed heads! That's IDEAL. Ideal would be 2 sprayings in spring, Gly or Liberty + heavy atrazine & personally, if early, I like to add a little DUAL II MAGNUM (Metolachlor) to keep on grasses and know that it will be long gone by time switch is up. other options to add: 2,4-d, 2 oz of Plateau/Panoramic or any shorter acting residual that can be sprayed in April/May that will be gone in 30-40 days. We want ATRAZINE to stay as long as possible. If flush of weeds, say FOXTAIL (most likely)...... 1) Mow as needed 2) spray Atrazine + crop oil + Quinclorac. If the switch is grown "tall", let's say 12" or taller, add 2,4-d. Switch sounds complicated BUT if you take the right steps, understand herbicides, how they work, understand when switch germinates - it's actually reasonably easy. It's not that complicated in all honesty. Preparation is KEY. FALL is time to get to work.... GET THAT SEED BED CLEAN!