Fertilising guide

How to fertilise Bob Gordon Elderberry (Sambucus nigra 'Bob Gordon')— schedule & NPK

Also called Bob Gordon Elderberry, Bob Gordon Elder.

More about bob gordon elderberry

About Bob Gordon Elderberry

Sambucus nigra 'Bob Gordon' · also called Bob Gordon Elderberry, Bob Gordon Elder · edible

Bob Gordon is a highly productive elderberry cultivar selected at the University of Missouri for exceptionally large berry clusters and superior juice yield. It produces prolific crops of deep purple-black berries with high anthocyanin content, prized for elderberry syrup, wine, and commercial processing. Upright and vigorous, it benefits from a pollinator companion cultivar such as Adams or Nova for maximum yield.

Growth habit: Vigorous, strongly upright multi-stemmed deciduous shrub, moderately suckering

Watch for — Low fruit set without a pollinator: Bob Gordon is not reliably self-fertile. Plant a second cultivar (Adams, Nova, or York) within 15–20 m to ensure cross-pollination and maximise berry cluster size and fruit set.

What fertiliser bob gordon elderberry actually wants — and why

Bob Gordon Elderberry 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 bob gordon elderberry: 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 bob gordon elderberry, 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 bob gordon elderberry:

In early spring apply a balanced fertiliser (e.g. 10-10-10 at the label rate for shrubs). In productive stands, a supplemental potassium feed at flowering helps berry development. Avoid heavy nitrogen in late season. 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 bob gordon elderberry 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 bob gordon elderberry

Follow the crop-feed label rate for bob gordon elderberry — 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 bob gordon elderberry first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the bob gordon elderberry watering schedule.

Signs you are over-feeding bob gordon elderberry

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

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 bob gordon elderberry

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 bob gordon elderberry 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 bob gordon elderberry 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 bob gordon elderberry

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 bob gordon elderberry — frequently asked questions

What fertiliser does bob gordon elderberry 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. Bob Gordon Elderberry 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 bob gordon elderberry?

In early spring apply a balanced fertiliser (e.g. 10-10-10 at the label rate for shrubs). In productive stands, a supplemental potassium feed at flowering helps berry development. Avoid heavy nitrogen in late season. In early spring apply a balanced fertiliser (e.g. 10-10-10 at the label rate for shrubs). In productive stands, a supplemental potassium feed at flowering helps berry development. Avoid heavy nitrogen in late season. 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 bob gordon elderberry?

What does over-feeding bob gordon elderberry 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 bob gordon elderberry 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 bob gordon elderberry?