Getting it to bloom

Why won't my Wood Vetch bloom? (and how to make it flower)

Also called Wood Vetch, Wood Pea (Vicia sylvatica).

More about wood vetch

About Wood Vetch

Vicia sylvatica · also called Wood Vetch, Wood Pea · flowering

Vicia sylvatica is an elegant, scrambling perennial legume native to the woodland margins, shaded cliffs, and rocky slopes of Europe and temperate Asia, producing long, arching racemes of 7–20 white flowers delicately veined in purple from June to August. It is considerably more shade-tolerant than other British vetches, thriving in the dappled light of open woodland or the shaded face of rocky banks. As a nitrogen-fixing legume it improves poor soils without supplemental feeding, making it a low-maintenance wildflower garden plant. Like other Vicia species, the seeds should be considered mildly toxic if consumed in significant quantities.

Plant type: flowering

Watch for — Aphid colonies on new growth: Vetch aphid readily colonises the soft growing tips and flower buds; in woodland-edge settings natural predators usually keep populations in check, but soft-soap spray can be used if required.

The reasons wood vetch isn't blooming

Almost every non-blooming wood vetch traces back to one of these, roughly in order of how common they are:

Too little sun — most of these need full sun (or very bright light) to flower well; shade gives leaves, not blooms.
Too much nitrogen feed, driving lush foliage at the expense of flowers (very common with general or lawn feeds).
The plant has not been deadheaded, so it stops flowering once it sets seed.
Irregular watering — drought or waterlogging at the budding stage makes buds abort.
It is still too young or was checked by a transplant and is rebuilding before flowering.

Feeding wood vetch a high-nitrogen general feed and growing it in too little sun — you get a big leafy plant and almost no flowers.

The fix — how to get wood vetch to flower

Maximise sun. Give wood vetch the sunniest spot you have — for most bedding and fruiting plants, more direct light directly means more flowers.
Switch the feed. Move off high-nitrogen feeds and use a higher-potassium "bloom" or tomato-type feed as it comes into flower.
Deadhead regularly. Remove spent flowers often to keep it producing more rather than stopping to set seed.
Water consistently. Keep moisture even through budding and flowering — drought-then-flood swings make buds drop.

Light and feeding do most of the heavy lifting here. Dial in the spot with the light guide for wood vetch and get the feeding right with the wood vetch fertilising schedule — the wrong feed (too much nitrogen) is one of the most common silent reasons a healthy plant makes leaves instead of flowers.

Bloom season and what to expect

Wood Vetch flowers across its growing season (mostly summer) and, kept fed and deadheaded, can bloom for many weeks or right up to frost.

Post-bloom care so it flowers again

Deadhead, keep feeding lightly, and many will rebloom; collect seed from the best plants at the end of the season if you want to grow them again.

For everything else this plant needs day to day, see the full wood vetch care brief and its watering schedule — a stressed, badly watered plant rarely has the energy to flower at all.

Wood Vetch blooming — frequently asked questions

Why won't my wood vetch flower?

Wood Vetch blooms on the season's growth given enough sun, warmth and the right feed — there is no cold or photoperiod trick, just good growing conditions and a bloom-leaning feed. The most common reason it is not happening: Too little sun — most of these need full sun (or very bright light) to flower well; shade gives leaves, not blooms.

How do I make wood vetch bloom?

Give wood vetch the sunniest spot you have — for most bedding and fruiting plants, more direct light directly means more flowers. Move off high-nitrogen feeds and use a higher-potassium "bloom" or tomato-type feed as it comes into flower.

When does wood vetch normally bloom?