If this card is in your Graveyard: You can send 1 Plant-Type monster from your hand or face-up from your field to the Graveyard, except "World Carrotweight Champion"; Special Summon this card. You can only use this effect of "World Carrotweight Champion" once per turn.
Rose Lover and Amarylease are used in the graveyard, so sending them there for World Carrotweight's effect benefits them both. Lord Poison helps with special summoning high level plant monster that you used to send to the graveyard for World Carrotweight's effect.
World Carrotweight Champion is also very good in a Sylvan deck since they can send it to the grave from your deck. This creates some possibility for some OTK by special summoning it from the grave by discarding a Rose Lover from your hand, then using Rose Lover's effect to special summon another monster, and you can still normal summon another monster.
Activates from your Graveyard / Sends from your hand to your Graveyard for cost / Sends from your field to your Graveyard for cost
Tried it in Aromages and it actually works well as an additional beater. One issue with Aromages is that they only have 1 low level beater, this alleviate that problem despite not being an Aromage monster. Aromages aim to summon Bergamot ASAP, but sometimes that's not possible and you have to rely on low level beaters first. And just 3 copies of Rosemary is sometimes not enough.
I once hit into a situation where I don't have any of the low level monsters in my hand for a few turns, causing me to lose a huge chunk of LP. Having more low level beaters means more chance to draw into them, which adds more to your chance to win the duel.
This card + rose lover + talaya = goodbye destruction