Gadenin日本語Get the appThe shape of a hazel year
A hazel does everything at unfamiliar times. It flowers when the bush is bare and the ground is frozen, sets nuts before most fruit trees have opened a bud, fills them through high summer, and is ready to harvest in late summer, weeks before the autumn nut season most people expect. Understanding that offset explains most of the mistakes growers make, including pruning off the catkins in early winter and leaving the crop on the bush into autumn for the squirrels.
There is also a long lead time inside the plant. The catkins you see shedding pollen in midwinter were formed the previous summer. The flower buds for next year's crop set while this year's nuts are filling. That is why summer work such as breaking side shoots and keeping the bush open pays off twelve months later rather than immediately.
The table below is a working summary. The detail for each job is in the planting, pollination, pruning, harvest and pest guides.
| Season | What the bush is doing | Your main job | What to watch |
|---|---|---|---|
| Midwinter | Catkins shedding, red female flowers open | Record flowering dates, hand shake catkins in still weather | Hard freeze below 20F (-7C) at full flower |
| Late winter | Flowering finished, still dormant | Structural pruning, coppice one or two old stems, pick off swollen big buds | Do not cut before the catkins have finished |
| Early spring | Buds breaking, leaves expanding | Mulch, clear grass from the root zone, plant nothing new now | Sap bleeding from late cuts |
| Late spring | Full leaf, tiny nuts visible in husks | Water young plants, remove soft suckers by tearing | Aphids on shoot tips, weevils laying |
| Midsummer | Nuts swelling, shells hardening | Break strong side shoots, deep water in drought | Nut drop from drought stress |
| Late summer | Husks yellowing, shells tan | Harvest, dry the nuts, gather everything off the ground | Squirrels start before you think it is ready |
| Autumn | Leaves coloring and falling, next year's catkins formed | Clear fallen nuts, cultivate soil under the bush, plant bare root | Mold on nuts left lying |
Winter: flowering and the pruning window
The season begins in the depths of winter, when the catkins that have hung stiff and green since late summer lengthen, soften and turn yellow. Walk the bushes weekly. Note which plant is shedding pollen and which is showing the tiny red female flowers along its twigs, because that overlap, or its absence, determines your entire crop. On a still, dry day, shake the branches of a shedding plant to lift pollen into the air over the others.
Do no cutting at all while catkins are yellow and active. Once they have gone brown and limp, usually late winter, do the structural pruning: dead and damaged wood first, then one or two of the oldest stems taken to the ground, then opening the center, then shortening vigorous side shoots to four to six buds. Clear the suckers at the same visit, keeping one or two well-placed ones as replacements.
Late winter is also the only easy time to find big bud mite. On bare twigs the infested buds are unmistakable, swollen and round like small peas among the normal pointed ones. Snap them off and bin or burn them. Twenty minutes now removes a large part of next year's population.
A single hard freeze during full flowering can wipe out that season's nuts. The bush is unharmed and crops normally the next year, so do not replant or change anything on the strength of one bad winter.
Spring and summer: filling the nuts
Spring is mostly a matter of leaving the bush alone. Do not prune once the sap is rising, since cuts bleed and heal badly. Instead, mulch 2-3 in (5-8 cm) over the root zone and keep a 3 ft (1 m) circle clear of grass around young plants, because grass competition slows an establishing hazel more than any pest does. Resist feeding: nitrogen produces a huge leafy bush with no nuts on it.
By late spring the fertilized flowers have become small green husks and you can see the shape of your crop for the first time. Count roughly how many clusters there are and on which bush, since that number compared with your harvest tells you exactly how much you lost and to what. Soft green suckers are easiest to remove now, torn away from the crown rather than cut.
Midsummer is the critical period for nut size. The kernels fill during high summer, and a drought at that point produces small, poorly filled nuts or an outright drop of green nuts in midsummer. A deep soak of several gallons once a week beats daily sprinkling. This is also when you break the strong side shoots part through and leave them hanging, letting light into the developing nuts and setting flower buds for next year.
- Late spring: clear the base Tear off soft green suckers at the crown while they come away easily. Mark the one or two you are keeping as replacement stems so nobody removes them on the next pass.
- Midsummer: water for kernel fill In any dry spell while the nuts are swelling, give each established bush a deep soak once a week. This is the only period when watering a mature hazel reliably changes the crop.
- Midsummer: break the side shoots Snap strong current-season side shoots part through and leave them hanging. Light reaches the nuts, extension growth stops, and flower buds form at the base for next season.
- Late summer: check weekly for color Once any husk edge starts browning, check the bushes every few days. Test-crack five nuts. Solid tan shells and crisp kernels mean pick now, not next week.
- Late summer: harvest and dry Pick everything that is ready plus everything already on the ground, float test to remove blanks and weevil-holed nuts, then dry one layer deep at 60-75F (16-24C) for two to four weeks before storing.
- Autumn: break the weevil cycle Clear and destroy every remaining nut under the bushes, then lightly cultivate the soil surface over the root zone to expose overwintering weevil pupae to frost and birds.
Autumn: harvest done, next year started
Once the crop is off, autumn is preparation. Clearing fallen nuts is not tidiness, it is pest control, since every weevil-infested nut left on the ground is an adult beetle next summer. Light cultivation under the bush at the same time exposes the pupae in the top inch or two of soil. These two jobs, done together in half an hour, do more for next year's nut quality than anything you could spray.
This is also the planting season. Bare-root hazels go in from leaf fall onwards, and autumn planting gives the roots months to settle before their first summer. If your flowering records showed that your existing plants do not overlap, now is when you fix it by adding a third plant, positioned upwind and within 50 ft (15 m) of the bush you want pollinated.
Look at the bush before the leaves drop and you can see next year's catkins already formed, short green fingers along the twigs. Their number is a rough forecast of the pollen you will have in midwinter. Note it, along with your harvest weight per bush, the proportion of floaters, the first husk color date and the date squirrels first appeared. Four or five numbers per bush per year, kept consistently, turn hazels from a crop that seems to succeed or fail at random into one where you know precisely which week to be ready.