@Pitoon is correct. It isn't mandatory to use standard notation in this forum (I doubt I follow it thoroughly on my website), but there are a number of situations when it can help keep things clear by either removing ambiguity, or by conveying information to the reader in fewer keystrokes/words. It's a bit like learning notation styles for a bibliography in high school; it introduces order that helps people convey information to each other in a situation where things easily get complex, or where the volume of information can be overwhelming.
Formal style suggests that we write:
Acer palmatum 'Bloodgood'
genus: capitalize and italicize
species: italicize
cultivar: single quote and capitalize
But in this context, bloodgood jm, is just as good and just as clear.
I mentioned Amoenum above, this is a subspecies, which are written in italics:
Acer palmatum subs.
amoenum
There's a lot more to it, this link might be helpful if you're interested. It's good to know but don't go crazy with this
Parts of a plant name include: • Genus MCM: capitalize and italicize. It is the same in singular or plural form; do not add “s.” Laurentia, Heuchera … • Species MCM: not capitalized but italicized. Laurentia fluviatilis, Heuchera sanguinea … An editor may refer to multiple species using the...
bhgstylebook.com