The once somewhat dirty, dusty, and dusky greenhouses now shine and sparkle, clean and pristine. Six of the large buildings are situated on the Hogwarts grounds and during your time at Hogwarts you may have class in every one - with the exception of Greenhouse Six. Six is locked and has been transformed into Professor Bunbury's personal garden and experimentation area. You will most likely never see the contents of that greenhouse, nor can you even peek inside past those magically
pink tinted windows!
Greenhouses one through three, however, are currently open to student aid and experimentation - with your professor's supervision, of course. Feel free to tend to the Venemous Tentaculas in Greenhouse Three and watch out for the Devil's Snare in the Greenhouse One!
If you traipse through each greenhouse, you will identify almost every sort of magical plant that has ever been taught at Hogwarts. Bubotubers, puffapods, fanged geraniums.....and that's not even mentioning the assortment of Muggle flowers in Greenhouse Two! Your professor keeps Greenhouse Four locked right now as it contains her collection of plants from around the world - no doubt an interesting subject you may wish to explore if you have a green thumb. Greenhouse Five is may be opened later in the term for more advanced students, if Bunbury feels you have the aptitude...
Each greenhouse has shelves and racks of tools and large cabinets in the corner containing any other necessities you may need. There's plenty of lab tables for setting up your own tinkering station and sinks to clean up in too. Don't forget to add to the compost pile behind the greenhouses, and help yourself to some fertilizer while you're back there!