This section is from the book "The Gardener V2", by William Thomson. Also available from Amazon: The New Organic Grower: A Master's Manual of Tools and Techniques for the Home and Market Gardener.
The weedy appearance of your Lobelia is the effect of the very web summer experienced in so many localities this year. In your climate Nemophila insignis would be far more effective. For blooming in August, sow the 1st of June in good soil, and when the seedlings can be handled, thin them out to about 4 inches by 10 inches, and you will not be disappointed. We have it beautiful now (middle of October), after 9° frost. For distant effect, no other blue that we have tried can at all approach it. Lobelia, even in a fine season, looks dull and leaden beside it when seen at a distance; and, of course, the Nemophila is far less trouble to grow.