((A's RP reminded me! Sorry it's late. I'd backdate this, but taking his sweet time making good on agreements is pretty IC for Starscream...))
Per A's request, Starscream had acquired several dozen large rosebushes of
the type the boy had asked for. He was inclined to send them on as is-uprooted, and dropping dirt everywhere-but the house elves he summoned to deliver them took it upon themselves to tightly wrap each bush's root ball in burlap, the proper way to transport them. It took the house elves several trips to deliver all the plants to A's greenhouse, the final one bearing a transcribed note pinned to the burlap that stated they were from Starscream.
Sunflora's request was able to be taken care of on the way to fulfill A's. A bit of radar jamming during a stealth trip to a power plant in the middle of the night was sufficient; Starscream's energy reserves were restored to full capacity, and it was simple enough to later siphon a tiny amount of the energy his systems naturally converted to Energon. This brilliant, glowing pink liquid was stored in a magically reinforced phial and delivered to Sunflora by a house elf, with a transcribed note attached specifying that it was liquid Energon.