Buy the 2015 Old Farmer's Almanac!
Reporting
Unfortunately, as IUnfortunately, as I understand it, once a spinach plant starts to bolt, you can't reverse it. Spinach begins to bolt due to increasing daylight (about 14 hours or longer) as well as warmer temperatures. You can continue to harvest the leaves for now until they become too bitter; in late summer (after temperatures have cooled a bit) or early fall, you can plant some more for a fall crop.

2015 Garden Calendar2015 Weather Watcher's Calendar2015 Recipes Calendar2015 Engagement Calendar 2015 Everyday Calendar2015 Country CalendarNew Year Cross StitchLobster Rope Doormats