Borage is the garden's cheerful workhorse: star-shaped blue flowers that bees adore, cucumber-flavoured leaves for salads and drinks, and a plant that improves the soil around it. It is a fast annual that self-seeds happily, and in Zone 11 it is at its best in the cooler months, when it can flower for weeks before the heat.
Like every crop in the tropics, borage rewards gardeners who work with Zone 11's seasons — the cooler, drier months and the hot, wet months — rather than against them. The planting calendar hub gives the Zone 11 picture month by month, and our guide to when to plant borage in Zone 9 shows how the timing shifts in a cooler zone.
Zone 11 at a glance
USDA Zone 11 covers the warmest, most tropical parts of the United States — Hawaii, southern Florida, Puerto Rico and the warmest coastal pockets. Winters are warm, with average winter lows of 40 to 50°F, and the growing season never really ends.
Zone 11 is frost-free year-round: there is no average last spring frost and no average first autumn frost. That means you plant by heat and by the wet and dry seasons, not by frost dates. These are USDA zone averages, not exact figures for any one garden — always check your local extension service and the forecast before planting.
| Detail | Zone 11 guidance |
|---|---|
| Average winter low | 40 to 50°F |
| Average last spring frost | Frost-free (no frost dates) |
| Average first autumn frost | Frost-free (no frost dates) |
| Days to germination | 7–14 days |
| Days to maturity | 50–60 days |
| Sowing | direct sow |
| Sun | full sun |
| Soil pH | 6.0–7.0 |
| Spacing | 12–18 inches |
| Water needs | moderate |
| Cold tolerance | hardy |
When to plant borage in Zone 11
Sow borage in Zone 11 in the cooler months, roughly November through February, when it can grow and flower before summer heat. Borage is a fast annual that tolerates warmth better than many herbs, but it still flowers longest in the cool season. Seeds germinate in 7–14 days and plants mature in 50–60 days. Zone 11 is frost-free, so there is no last frost date to count back from — sow by the cool season, and check your local extension service for the best local window.
Starting borage in Zone 11
Borage is direct-sown: it dislikes transplanting because of its taproot, so sow seed where it is to grow. Sow seed about a half-inch deep, thin seedlings to 12–18 inches apart, and keep the soil moist until they are up in 7–14 days. Borage self-seeds freely — often so freely that one sowing gives you plants for years, as volunteers appear each cool season. Give it room: a single plant can grow three feet tall and two feet wide.
Soil, spacing, sun and water
Borage needs full sun and well-drained soil with a pH of 6.0–7.0. It tolerates poor soil and is famously unfussy, but it grows biggest in soil enriched with compost. Water needs are moderate — keep the soil evenly moist while plants are young, then water in dry spells. In Zone 11, borage does well in a raised bed or at the edge of a vegetable bed, where its deep roots can reach moisture without waterlogging.
Companion planting
Good companions for borage include tomatoes, peppers, marigolds and cabbage. Borage is one of the best companion plants there is: its flowers draw in bees and hoverflies, and it is a classic partner for tomatoes, strawberries and squash. Chamomile flowers on a similar schedule and shares a bed well — see our guide to when to plant chamomile in Zone 11. Borage is said to improve the flavour of nearby strawberries. The companion planting finder can suggest combinations for your whole bed.
Pests and problems
The common pests to watch for with borage are aphids, slugs and cutworms. Aphids cluster on young tips — wash them off with water. Slugs nibble young seedlings in wet weather; water in the morning and keep mulch away from the crown. Cutworms can sever young seedlings at soil level, so protect new plantings with a cardboard collar. Borage is otherwise a vigorous, trouble-free plant, and its hairy leaves put off many pests.
Harvest and storage
Harvest borage 50–60 days after sowing. Pick young leaves for salads and drinks, and pick flowers as they open — the blue stars are edible and look lovely frozen in ice cubes or scattered over salads. The more flowers you pick, the more the plant makes. Leaves are best young, since older leaves get coarse and prickly. Let a few plants go to seed at the end of the season for next year's volunteers, and pull spent plants before they take over the bed.
Borage as a garden helper
Borage earns its place even if you never eat a leaf: its deep roots break up compacted soil, its flowers feed bees for months, and its leaves make a fast, nutrient-rich addition to the compost heap. Sow it at the edge of a vegetable bed and let it self-seed, pulling out volunteers you do not want while they are small. One warning: borage leaves are covered in fine, prickly hairs, so wear gloves when handling mature plants, and pick leaves young, while they are still soft enough for salads.
Frequently asked questions
When should I plant borage in Zone 11?
Sow in the cooler months, roughly November through February. Seeds germinate in 7–14 days and plants mature in 50–60 days. Borage self-seeds, so one sowing often gives you plants for years.
Is borage really good for tomatoes?
Yes — borage is a classic tomato companion. Its flowers attract bees and hoverflies, and it is said to improve the growth and flavour of nearby tomatoes and strawberries.
Can I eat borage flowers?
Yes. The blue star-shaped flowers are edible, with a mild cucumber flavour. Pick them as they open and use them fresh in salads and drinks.
Why is borage taking over my garden?
It self-seeds freely. Pull volunteers you do not want while they are small, and cut spent plants down before they set seed if you want to limit it.