Fertilising guide

How to fertilise Black Mission Fig (Ficus carica)— schedule & NPK

Also called Mission Fig, Black Spanish Fig, Franciscana Fig.

More about black mission fig

About Black Mission Fig

Ficus carica · also called Mission Fig, Black Spanish Fig · edible

Black Mission Fig is a heritage cultivar of common fig introduced to California by Franciscan missionaries, bearing small to medium purple-black fruits with intensely sweet, jam-like pink flesh. It is prolific, self-fertile, and favoured for drying. Like all Ficus, its latex sap is toxic to pets; classified as toxic.

Growth habit: Vigorous deciduous spreading tree

Watch for — Nitrogen excess: Over-fertilising promotes lush foliage at the expense of fruit. Use low-nitrogen feeds after initial spring application.

What fertiliser black mission fig actually wants — and why

Black Mission Fig 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 black mission fig: 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 black mission fig, 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 black mission fig:

Apply a general-purpose fertiliser in spring; switch to a high-potassium formula (tomato feed) from early summer onwards. Black Mission benefits from slightly less nitrogen than more vigorous cultivars to keep growth in check. 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 black mission fig 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 black mission fig

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

Signs you are over-feeding black mission fig

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

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 black mission fig

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 black mission fig 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 black mission fig 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 black mission fig

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 black mission fig — frequently asked questions

What fertiliser does black mission fig 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. Black Mission Fig 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 black mission fig?

Apply a general-purpose fertiliser in spring; switch to a high-potassium formula (tomato feed) from early summer onwards. Black Mission benefits from slightly less nitrogen than more vigorous cultivars to keep growth in check. Apply a general-purpose fertiliser in spring; switch to a high-potassium formula (tomato feed) from early summer onwards. Black Mission benefits from slightly less nitrogen than more vigorous cultivars to keep growth in check. 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 black mission fig?

What does over-feeding black mission fig 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 black mission fig 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 black mission fig?