After patting the soil, she took out her wand from the foldings of her robes, carefully not to took out Egg and sent it across the greenhouse; it would be a disaster if Egg rolled around here, knocking people off the floor and tickling ankles while they're doing the vital part of this activity
.
"Aguamenti!" That is one useful spell she had learned in Potions.

Not too much, she said in her heart, not too much, there.