Harvest is over: what to do in the vineyard before leaf fall

Once the last bin reaches the cellar, all attention shifts to the tanks. Understandable — but the vineyard has not stopped. Between harvest and leaf fall, the vines are doing something the next vintage depends on: storing reserves in the wood and the roots. What you do (or skip) in these weeks shows up at budburst, in bud fruitfulness and in how well the vines handle next summer.

1. Keep the leaves working

After harvest, the sugars the leaves produce no longer go to the bunches: they go into the starch the vine stores in its trunk, arms and roots. That starch fuels budburst and early growth until the first leaves mature next spring. A canopy that drops early — to late downy mildew, powdery mildew, mites, extreme water stress or an early frost — is a vineyard that goes into winter with a half-full tank.

• Walk the blocks and look at the canopy, not just at what is left on the vines.
• If downy or powdery mildew is active with significant defoliation, consider a post-harvest spray — especially in young or already weakened vineyards.
• An autumn copper spray counts towards the year’s per-hectare copper budget like any other.
• Avoid unnecessary machinery passes that break still-functional foliage.

The rule of thumb: the vine should lose its leaves because autumn arrived, not because disease or drought took them early.

2. Water and nutrients: the autumn window

In dry regions, a rainless autumn can close the season with the vines under stress. Where irrigation exists, one or two post-harvest irrigations on very dry soils help the leaves stay active and the roots grow (the second root-growth flush happens right now). The goal is not to push new shoots: it is to keep the vine from closing its cycle in distress.

It is also the right time to think about fertilisation:

• Take soil samples now, while the ground is accessible and before heavy rain — they are the basis for next year’s fertilisation plan.
• Phosphorus, potassium, magnesium and amendments (lime, organic matter) go on well in autumn and are worked in by winter rain.
• Compost and manure: spread now, so they integrate into the soil by spring.
• Nitrogen only in small doses while the leaves are active, and only where vigour was below target — excess leaches with the rain and never reaches the vine.

3. Sanitation: reduce next year’s inoculum

Many of the diseases you will fight in May are overwintering in the vineyard right now. A little autumn clean-up is the cheapest spray of the following year.

• Remove mummified bunches and rot residue left on the vines — they carry black rot and botrytis.
• Leaves with downy mildew produce the oospores that start next spring’s primary infections: mulching and incorporating fallen leaves speeds up their breakdown.
• Record where disease hotspots appeared during the season. Those spots deserve extra attention next year.

4. Mark the vines before the leaves fall

This is the last chance of the year to see certain problems. Esca leaf symptoms, leafroll virus, nutrient deficiencies and dead or weak vines are only easy to tell apart with leaves on. After leaf fall, everything looks the same.

• Mark vines showing esca and trunk-disease symptoms — to prune them separately, disinfect shears and, if needed, pull and replant.
• Count gaps and dead vines per block to plan winter replanting.
• Note patches of weak or excessive vigour: they are the starting point for adjusting fertilisation and bud load at pruning.

A ribbon on the vine helps; a geotagged observation on the block helps more, because in January, with pruning under way, nobody remembers which row it was.

5. Soil for winter: cover crops and erosion

The first autumn rains open the sowing window for cover crops — cereals, legumes or mixes, depending on the goal (structure, nitrogen, competition with the vine). Soil that is covered in winter loses less earth, infiltrates more water and builds organic matter.

• Sow cover crops in the inter-rows as soon as there is soil moisture.
• Clear ditches, drains and water crossings before heavy rain.
• Revisit areas that showed erosion last season — gullies at row ends, washed-out inter-rows.

6. Trellis and pruning prep

With no fruit on the vines and before pruning, it is time to check the trellis: broken posts, loose or snapped wires, tensioners, and the drip system (leaks, clogged emitters, filters). It is also the moment to assess cane lignification — how well shoots have hardened off — which tells you whether the vine is closing its cycle properly and helps decide how many buds to leave at pruning.

7. Close the season on record (while you remember)

Harvest produces the year’s most important numbers, and they are fresh now: kilos per block, picking dates, ripeness at intake, fruit health. Add the spray and fertilisation history and you have the full picture of the season — and the right questions for the next one.

• Yield per block (kg/ha) and comparison with last year.
• The season’s sprays closed out in the field records, with nothing pending — which is what inspection and certification will ask for.
• Cumulative metallic copper per hectare, if you farm organically.
• What went well and what did not: disease, vigour, uneven ripening.

Summary: the post-harvest checklist

• Protect the canopy until natural leaf fall.
• Post-harvest irrigation on very dry soils, where irrigation exists.
• Soil analyses and base fertilisation (P, K, Mg, amendments, compost).
• Remove mummified bunches and reduce downy mildew inoculum.
• Mark vines with esca, virus, gaps and vigour patches — with leaves on.
• Sow cover crops and prepare the soil for the rains.
• Check posts, wires and irrigation; assess cane lignification to plan pruning.
• Close the season: yield per block, field records, copper, lessons learned.

Harvest ends when the grapes reach the cellar; the vineyard season only ends when the leaves fall. These weeks are the first step of next year — and one of the cheapest.