What to do in heat of summer?
This spring I had a lovely patch of Johnny Jump Ups that had pretty much seeded themselves from a few plants last year. But now, in the heat of summer, they've all died back. What do the rest of you do to keep their space filled with color through the summer? Did you plan ahead and buy impatiens earlier in the season (back when they were widely available) to fill in when the violets give out? What's a good strategy?
Thank you for the advice,