I usually prepare the soil before planting seedlings, mix the soil with sand, compost and manure, sometimes add last year's leaves. I often cultivate seedlings and suggested that they would develop well.
When forecasted on cold nights, I placed the most delicate flowers in the greenhouse. Then I had to return to the city, I covered them with a special cloth, and begonia and fuchsia were not affected by the cold.
It's June the days and nights are warm, Asters Sunflowers Impatiens Gladioli Pelargonium grow in tubs, tolerate night temperatures well. Nasturtuim and Brachycome began to bloom in hanging pots.
I noticed that the smaller the container is, the soil dries out faster and plants need to be watered more often.
It's June, the first month of summer. Here we call it "top of the year" or Midsummer. Plants became stronger and bloom more beautifully.
I wish you warm and sunny weather.