Fertilising guide

How to fertilise Lang Jujube (Ziziphus jujuba 'Lang')— schedule & NPK

Also called Lang jujube, Chinese date Lang.

More about lang jujube

About Lang Jujube

Ziziphus jujuba 'Lang' · also called Lang jujube, Chinese date Lang · edible

'Lang' is a classic jujube cultivar bearing pear-shaped, reddish-brown fruit best dried, when it develops a rich, date-like sweetness. A heat-loving, drought-tolerant deciduous tree, it crops most heavily when cross-pollinated by 'Li'. Like all jujubes it shrugs off poor, alkaline, saline soil and arid heat, making it productive where conventional fruit trees struggle.

Growth habit: Upright deciduous tree with arching, somewhat weeping zigzag branches and glossy foliage; suckers freely from the roots. Flowers and leafs out late, carrying tiny fragrant blossoms over weeks.

What fertiliser lang jujube actually wants — and why

Lang Jujube feeds in two distinct phases — balanced to build the plant, then high-potassium the moment flowering starts to set and fill a heavy crop.

For the language behind the three numbers on the bottle — what nitrogen, phosphorus and potassium each do — see the NPK ratio explained entry. The short version for lang jujube: match the feed to the job the plant is doing right now, not to a generic “plant food” on the shelf.

How often to feed lang jujube, and which months

Feeding only earns its keep while the plant is in active growth and can use the nutrients — pour feed into a dormant or low-light plant and it simply builds up as root-burning salt. For lang jujube:

Undemanding. A spring application of balanced fertiliser or compost suffices; jujubes fruit well in lean soils. Excess nitrogen promotes suckering and leafy growth rather than fruit. So: a balanced feed or compost at planting, then a high-potash liquid every 1-2 weeks from first flower through harvest across the main season (spring through early autumn).

The dormant-season rule matters more than the exact interval: skip feeding entirely when lang jujube is resting. For the wider context on indoor feeding rhythms across the seasons, the houseplant fertiliser schedule walks through the year month by month.

What strength to mix for lang jujube

Follow the crop-feed label rate for lang jujube — these are calibrated for hungry vegetables. Consistency through fruiting matters more than strength; erratic feeding causes problems like blossom-end rot.

Feeding always goes onto already-damp soil, never dry roots — water lang jujube first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the lang jujube watering schedule.

Signs you are over-feeding lang jujube

Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for lang jujube:

Vigorous dark-green leafy growth but few flowers or fruit (excess nitrogen).
Lush foliage hiding the crop; soft growth prone to pests and disease.
Salt crust on the soil and scorched leaf edges in containers.

Signs you are under-feeding lang jujube

Pale, yellowing lower leaves and stunted growth.
Small fruit, poor set, and a quickly exhausted plant.
Blossom-end rot and weak cropping from erratic or insufficient feeding.

If the symptoms point at watering, light or roots rather than nutrition, the full lang jujube care brief covers soil, humidity and the common problems for this species.

Flushing and leaching the salts

In containers, fertiliser salts build up fast — water lang jujube thoroughly so excess drains from the base each time, and flush pots with plain water every few weeks to prevent a damaging salt build-up.

Organic vs synthetic feeds for lang jujube

Organic options

Garden compost or well-rotted manure dug in before planting, plus a liquid comfrey or seaweed feed once fruiting starts. UK: comfrey feed or organic Tomorite; US: Espoma Tomato-tone or Neptune's Harvest. Builds soil and feeds in one.

Synthetic / liquid feeds

A balanced feed at planting then a high-potash tomato feed in fruiting — UK: Growmore at planting then Tomorite (Levington) or Phostrogen; US: a balanced 10-10-10 then Miracle-Gro Tomato or a bloom booster.

Brand names are examples, not endorsements, and UK and US ranges differ — check the label’s own NPK and dilution rate, since formulations change.

Fertilising lang jujube — frequently asked questions

What fertiliser does lang jujube need?

Balanced (even N-P-K) at planting for roots and frame, then switch to a high-potassium ("high-potash") tomato-style feed once the first flowers open — potassium is what sizes and ripens fruit, not nitrogen. Lang Jujube feeds in two distinct phases — balanced to build the plant, then high-potassium the moment flowering starts to set and fill a heavy crop.

How often should I feed lang jujube?

Undemanding. A spring application of balanced fertiliser or compost suffices; jujubes fruit well in lean soils. Excess nitrogen promotes suckering and leafy growth rather than fruit. Undemanding. A spring application of balanced fertiliser or compost suffices; jujubes fruit well in lean soils. Excess nitrogen promotes suckering and leafy growth rather than fruit. So: a balanced feed or compost at planting, then a high-potash liquid every 1-2 weeks from first flower through harvest across the main season (spring through early autumn).

What strength of feed for lang jujube?

What does over-feeding lang jujube look like?

Vigorous dark-green leafy growth but few flowers or fruit (excess nitrogen). Lush foliage hiding the crop; soft growth prone to pests and disease. Salt crust on the soil and scorched leaf edges in containers. Staying on a high-nitrogen feed once lang jujube starts flowering is the classic error — you get a huge leafy plant and a disappointing crop. Switch to high-potash the moment flowers appear.

Should I flush the soil of lang jujube?