A modest order of bulbs should arrive in the next few days, and if it’s not raining, a rarity in recent months, perishable dogtooth violets (Erythronium ‘Pagoda’, below) must be planted this weekend. Planting of dwarf irises (Iris bucharica) and Winter aconites (Eranthis hyemalis) can be delayed, but why wait, in particular since there are…