You can perform a massive swarm with this card and 3 "Naturia Hydrangea". First Normal Summon this card while your opponent controls a monster. Activate this card's effect and summon a "Naturia Hydrangea" from your hand. Since you activated "Naturia Pumpkin's" effect this turn, this will allow you to Special Summon 2 more "Naturia Hydrangea" from your hand.
The above combo works even better if you have 3 "Hydrangea" in hand along with another "Naturia" monster as you can Summon the other monster first and then follow up with the 3 "Hydrangea" from your hand.
This card can create a OTK if you have this card, 3 "Naturia Hydrangea", and any "Naturia" monster with 900 or more ATK in hand. First summon this monster while your opponent controls at least 1 monster. Activate its effect and summon the 900 ATK or greater "Naturia" monster from your hand. Special Summon the 3 "Naturia Hydrangea" in Attack Position. Remove your opponent's monster(s) with something like "Smashing Ground" and attack for game.
When you Summon this card and resolve its effect, you can activate "Inferno Reckless Summon" to get 3 monsters instead of only 1. Good options would be "Naturia Mosquito", so you can ram 2 "Naturia Mosquito" and "Naturia Pumpkin" against the highest-ATK monster your opponent controls for massive damage, or "Naturia Fruitfly", to steal pretty much anything.
Use this card's effect to Special Summon a Level 4 "Naturia" monster for an easy Rank 4 Xyz Summon.