Asparagus-Planting Time: Asparagus tests even the most committed gardener, asking for a major feat of excavation followed by a lot of patience. Whatever kind you’re planting (hopefully an all-male strain like one of the Jersey types, which yield 20 to 30 percent more than dear old ‘Martha Washington’) you have to dig a trench about 18 inches wide and deep—no less than a foot in each direction, please. Here’s how.Less-Than-Spectacular Daffodils? They need a diagnosis, now… and a remedy, even sooner. Too much Nitrogen, too little of other nutrients, overcrowding, not enough sun or moisture: These are just some of the factors that can cause Narcissus to make leaves but few flowers. Get the lowdown here (or for all your bulb worries, including this one, try the Bulb FAQ page).Potatoes—Prep Now, Plant Soon: While prepping my vegetable garden last week, I unearthed several potatoes that eluded me last fall. Potatoes go in early, a week or two before the final frost