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Spring is the perfect time to divide and plant herbaceous perennials. After 2-5 years clumps of most perennials become overcrowded and their vigour deteriorates. As a result plants produce fewer flowers, and loose some of their ornamental value. As a general rule, spring is the best time to divide and plant summer- and autumn-flowering plants (starting with mid-June), and ornamental grasses (miscanthus, reed grass, feather grass).
Most bulbs are planted in autumn to flower next spring. Usually tulips are planted in early October, when soil temperature at the depth of 10-12 cm drops to +10C. If autumn is warm, tulips can be planted throughout October, even as late as early November. Experienced growers maintain that one can plant tulips even in midwinter, as long as the ground is not frozen over. Bear in mind that mulching with a 25cm layer of sawdust, peat or compost is absolutely necessary in such case. Bulbs root within three weeks – this is how long it should take before the ground completely freezes over. If planted too early, bulbs will break into growth too soon.