Espalier a Conference Pear on Quince A Rootstock into a 4-Tier Frame Against a Fence

Start with the wire, not the tree

Four horizontal wires, the lowest at 40cm off the ground and each subsequent one 40cm above the last, put the top tier at 160cm. That is the frame a four-tier Conference espalier grows into, and it goes up before the tree arrives. Use 12 or 14 gauge galvanised wire, tensioned hard. On a timber fence, drive vine eyes into the posts; on masonry, use screw-in vine eyes with wall plugs and set them 10cm proud so the foliage does not sit flat against the boards where it stays damp and scabby.

Tension matters more than gardeners expect. A pear branch trained horizontally for three seasons will pull a slack wire into a shallow V, and the whole tier sags out of line. Gripple tensioners or a straining bolt at one end let you retighten each spring. Space the vine eyes no more than 1.8m apart along a run, closer if the fence flexes. The frame should ring faintly when you pluck a wire. Do this part properly and the tree does the rest of the work for you over the next four winters.

Why Quince A and not Quince C

Quince A is the semi-vigorous pear rootstock, and for a four-tier structure roughly 1.8m tall and 2 to 3m wide, it hits the mark. Quince C is more dwarfing and suits a two or three-tier cordon-scale espalier or poorer soils, but it can run out of steam before it fills a full four-tier frame, particularly on light sand or in a windy site. Conference on Quince A gives you enough annual extension to lay down one new tier per year and still crop the lower tiers once they are established.

There is a compatibility wrinkle worth naming. Conference is one of the pear varieties that unites directly with quince without an interstem, which is why it is the classic espalier choice. Varieties like Williams Bon Chrétien are graft-incompatible with quince and need an intermediate stem of a compatible variety, adding a union and a weak point. Buy a maiden whip or a two-year-old partly-trained tree from a fruit specialist such as Keepers Nursery or Blackmoor, and confirm the rootstock is stated as Quince A on the label. A bare-root maiden planted between November and March establishes faster than a containerised tree potted the same autumn.

The first winter cut

Plant the maiden 15 to 20cm clear of the fence with the graft union well above soil level, and cut the stem back to just above the lowest wire. Make the cut to leave three good buds: one to carry on vertically as the central leader, and two below it, one facing left and one facing right, to become the first tier.

Laying the tiers

The arms do not go horizontal in year one. Through the first summer, tie the two side shoots to canes set at about 45 degrees off the vertical leader, and let the leader run straight up. A shoot held at 45 degrees keeps its vigour and extends faster than one pinned flat, because horizontal training slows sap flow and can stall a young arm before it has any length. The leader, meanwhile, produces the buds you need for tier two.

The following winter, drop each of the two side arms down onto the lowest wire and tie them along it with soft twine or Flexi-Tie, spacing the ties every 30cm. Now cut the leader back again to just above the second wire, once more leaving a vertical bud and a left and right bud. Repeat the whole sequence: 45 degrees in summer, horizontal in the dormant season, leader shortened to the next wire.

By the fourth winter you have laid all four tiers and the leader can be stopped at the top wire, cut back to a single bud each year thereafter to hold the height. Any arm that has reached its neighbour’s territory or the end of the fence gets its tip pruned to a downward-facing bud in late winter, which checks extension without provoking a mass of watershoots.

Extension growth on the arms is left long over summer and shortened in the dormant cut, taking each arm back by roughly a third of the season’s new wood to a bud pointing in the direction you want the arm to continue. Vertical shoots erupting along the top of an established arm are the raw material for fruiting spurs, not a nuisance to be sawn off wholesale.

Summer pruning is where the crop comes from

Conference fruits on spurs, and spurs are built by summer pruning to the Modified Lorette System. In mid to late summer, once the base of the new shoots has gone woody and stiff, shorten every mature side shoot longer than about 20cm back to three leaves above the basal cluster. Shoots growing directly from an existing spur get cut to one leaf above the cluster.

The timing is the whole trick. Cut too early, while shoots are still soft and green, and the tree responds by pushing secondary growth from the buds below the cut, undoing the work. Wait until the wood has firmed, usually from the second half of July into August in most of the UK and cooler-temperate zones, and the buds left behind swell into fruit buds instead of breaking into leaf. Any secondary shoots that do appear after the main summer cut are tidied back to one leaf in early autumn.

Over three or four seasons this builds up the knobbly, branched spur systems that carry Conference’s crop. Spur systems eventually get congested; when a spur cluster has more than four or five fruit buds crowded together, thin it in winter by removing the oldest and weakest, which improves fruit size and lets light onto the ripening pears.

A worked spacing example

Take a fence run of 5m. With the tree planted 15cm off the boards and each tier extending symmetrically left and right, aim for arms roughly 1.2 to 1.5m long on each side, giving a total spread of 2.4 to 3m per tree. That leaves room to plant a second Conference, or a compatible pollination partner, at the far end. Conference is partially self-fertile but crops far more heavily with a pollinator in the same flowering group, so a Beth or a Concorde on Quince A within a few metres lifts fruit set noticeably.

With four tiers at 40cm spacing and arms averaging 1.35m per side, one tree presents about 10.8m of horizontal fruiting wood (4 tiers times 2 arms times 1.35m). At mature spur density that is a serious crop off a structure occupying barely a metre of border depth, which is the entire point of espalier against a boundary.

Feeding and the first three years

A newly planted espalier wants steady, not lavish, feeding. Overfeed a young Conference with high-nitrogen fertiliser and it throws long whippy watershoots that refuse to form spurs, which is the opposite of what a trained tree needs. A spring topdressing of sulphate of potash at around 20g per square metre, plus a balanced feed such as blood, fish and bone at planting, keeps the balance toward fruit buds over leaf.

Mulch a 60cm circle around the base with well-rotted manure or garden compost in early spring, kept clear of the graft union and the stem itself. Water deeply through the first two summers, particularly on Quince A which is shallower-rooted than a pear-seedling rootstock and feels drought earlier. Once the four tiers are laid and cropping, the tree becomes largely self-sustaining and the annual work drops to two visits: the dormant structural cut and the summer spur pruning.

What the frame will not tell you in advance is how a given fence aspect changes the timetable. A south or west-facing run ripens spurs faster and may let you summer-prune a fortnight earlier than a north-east boundary, and whether your particular site pushes Conference toward vigour or toward early cropping is something only the first two seasons of extension growth will reveal.