Planting spring bulbs in fall: timing, depth and the right tools

Every spring garden that bursts into color in April was planted on a chilly afternoon the fall before. Bulbs ask for very little, but they do ask for good timing. Get them in the ground at the right moment and they will reward you for years.

Why bulbs need the cold

Tulips, daffodils, crocuses and hyacinths need a long spell of cold, damp soil before they can flower. Gardeners call this vernalization: during those weeks the bulb builds up what it needs to grow and bloom in spring. Bulbs that never get properly cold often come up weak or do not flower at all.

When to plant

Plant once the evenings turn cool but before the ground freezes. In much of the US that means September to November, a little earlier in the North and later in the South. The soil is still warm enough for roots to grow, while the air is already cooling down. A bulb that has a few weeks to root before winter comes up stronger in spring. Leave it until the ground is frozen and the bulb may not root in time, which gives you thin stems or no flowers.

How to pick good bulbs

• Choose firm, heavy bulbs without mold or damage; soft or shriveled bulbs rarely bloom well.
• Mix flowering times: crocuses open first, tulips and daffodils follow later in spring.
• Think about height and color, so short bulbs are not hidden behind tall ones.
• Plant at the right depth and spacing; as a rule of thumb, a bulb goes about two to three times as deep as it is tall, and the label tells you the rest.

Tools that make bulb planting easier

Planting ten bulbs is a pleasant job. Planting two hundred is a workout. The right tool makes the difference between a sore back and an afternoon well spent.

A long-handled bulb planter

With a long handle you can plant standing up. Push the sharp, tapered cylinder into the ground with your foot, lift out a neat plug of soil, drop in the bulb and let the soil fall back. It cuts through most soil types and is the tool to reach for when you plant in large numbers or in a lawn.

A short-handled bulb planter

For pots, raised beds and tight corners of a border, a hand bulb planter does the same job up close. The ash handle sits comfortably in your hand, so you can place each bulb exactly where you want it.

A dibber

A dibber makes a narrow, precise hole at exactly the depth you want, which is ideal for small bulbs such as crocuses and grape hyacinths, and handy in heavier soil. For larger bulbs, or for potatoes, a wider potato and bulb planter makes bigger holes in one go.

Why it pays to plant on time

Bulbs that root well before winter flower more reliably, stand up better to late frosts and wet spells, and are less prone to disease. They also need less looking after. A strong bulb will often come back for several years, so one afternoon of work keeps giving.

Get them in the ground this week

It is easy to think of fall as the time to put the garden to bed, but for bulbs it is the start of the season. Pick a dry afternoon, grab a bag of bulbs and a planter that does the hard work for you, and spring will take care of the rest.

Tools for life and generations to come.