November 5, 2026: Harvest Wrap-Up Week — Three Herbs for Your Bladder, Your Joints, and Your Heart

Early November around here is when the trees start really putting on a show- and at the same time we may have 70F degree days. It’s confusing for people who are still getting used the time change and earlier sunsets. A bit north of me, the commercial cranberry harvest (roughly mid-September to early November) is winding down. Across the Mediterranean, olive growers are in harvest and pruning season, when olive leaves come off the trees in quantity.

Those are the focus this week, along with a spiny Pacific Northwest shrub- whose study left me a little confused on this particular herb.

American cranberry is a low, creeping evergreen vine with small, glossy leaves and round red berries about half an inch across. This is the tail end of its season. "Mountain cranberry" is lingonberry, a different plant.

Perhaps it was those commercials from childhood, but I’ve been trained to think of cranberry as a ‘bog’ plant. The truth is that the fields are flooded because it’s the most efficient way to harvest the berries as they float along the top of the water. I learned that cranberries used for juice and sauces are often harvested this way, while whole fresh sold cranberries are usually harvested dry (mechanically) to preserve quality and minimize bruising.

Cranberry can be grown easily in the home garden - as long as you have the right climate.

Self-Harvest: Cranberry is native to the North East United States and has naturalized much of the West Coast, but I couldn't confirm wild-harvest timing, so for most of us the practical source is a grocery store or farm stand. Or grow your own if you’re in the right climate!
Buy It: Mountain Rose Herbs sells an organic cranberry powder of V. macrocarpon fruit, grown in the USA. The listing doesn't say whether it's juice powder or whole-fruit powder, so don't treat it as the same thing as the juice and capsule products in the studies below.

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Ripe berries are plump, firm and deep red; fresh ones "bounce." Plants usually need three years to fruit.

You don't need a bog. Cranberries are hardy from USDA zones 2 to 7 and want acidic (pH roughly 4 to 5.5), well-drained soil in sun. Think blueberry friendly soil - they are related, after all!

Refrigerate: about 2 weeks, or up to about 4 in the original packaging.
Freeze: stem, sort, wash, drain, pack with headspace, and freeze at 0°F or colder. Use within 9 to 12 months, rinsing but not thawing.
Dry: dip in boiling water to crack the skins, then check after 24 to 36 hours. No source gave a temperature or confirmed drying preserves the active compounds.
Tinctures, vinegars, glycerites: I couldn't find verified home ratios, so I won't invent any.

Food and drink: The best-supported use of whole berries is as food.
Recurrent UTI prevention (women): The research below is on juice, tablets and capsules, not home-prepared berries. There's no established dose of proanthocyanidins (PACs, the plant compounds thought to be responsible); 36 to 72 mg is commonly recommended, but studies found no clear difference between low and high doses. One trial used one 240 mL (8 oz) serving of juice beverage a day. No source converts PAC milligrams to a number of berries.

Cranberry is not a treatment for an existing UTI; see a provider if you have symptoms. Very large amounts can cause stomach upset and diarrhea. On warfarin, the evidence is conflicting, so talk to your provider (a 2025 review found juice up to 240 mL a day appeared safe, with limited evidence). If you're prone to kidney stones, I found no clear guidance either way, so ask. Food amounts appear safe in pregnancy and breastfeeding.
Other safety measures may be appropriate for you. Always consult a physician.

Cranberry has moderate-certainty evidence for preventing recurrent UTIs in women, but only from juice, tablets and capsules. None covers home-prepared berries, tea or tincture, or treating an active infection.

The anchor is a Cochrane review of 50 randomized trials with 8,857 participants. Cranberry products cut symptomatic, culture-confirmed UTIs by about 30% (relative risk 0.70: 70 infections for every 100 in the comparison group). Benefit showed in women with recurrent UTIs, but little in older people in institutional care or pregnant women. Results varied a lot between trials. Cochrane summary · full text

In a double-blind trial of 373 women with a recent UTI, daily juice beverage for 24 weeks meant 39 UTI episodes versus 67 on placebo (from an industry group's abstract page). Abstract

Not every trial is positive: a Yale-led trial of 185 nursing-home women (average age 86) on cranberry capsules for a year found no difference from placebo (29.1% versus 29.0% with bacteria and white blood cells in the urine). Summary

Devil's club grows in moist, shaded forests and ravines from south-central Alaska down the coast to southern Oregon, east to the Yukon, Idaho and western Montana. Stems are thick and spiny, the leaves are large and maple-like with spines on the veins, and the red berries are considered poisonous. I found no report of harvest this week; one herbalist prefers fall after leaf drop, others spring.

Self-Harvest: It's slow-growing and favors older forests, so wildcrafting is a sustainability question.
Buy It: Herbco sells cut-and-sifted wildcrafted root bark (not organic, from the United States), and Laughing Lichen in northern coastal British Columbia sells hand-peeled, dried, wildcrafted root bark. Mountain Rose Herbs carries only a 1:3 fresh root bark extract in 50 to 60% alcohol from wild-harvested bark (not labeled organic), and its listing advises consulting a practitioner.

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The part used is the inner bark of the rooted, spineless, creeping stems. One practitioner (Ravensong Herbals) says to skip the spiny upright stems, whose bark is thin and which are slow to recover. Wear gloves.

Her sustainability rules: harvest only from large colonies (ideally half an acre or more), take no more than 5% of a patch, avoid trails and stream banks, and cut only sections rooted in at least two places. Stems in clearcuts may need 10 years or more to regrow to old-growth size. Study

Processing: scrape off outer bark, moss and spines with a dull knife, strip the inner bark with the sharp edge, and snip small. Process within a day or two; one source says drying loses volatile oils and dried bark gives off irritating vapors.
Tincture: herbalist Michael Moore (quoted on a secondary site) gives 1:2 for fresh root and 1:5 for dry root bark, both in 60% alcohol. They aren't interchangeable.
Decoction: a gentle, covered simmer. Vinegar, oil and salve versions exist, but I found no ratios.

Traditional uses: Arthritis, digestive complaints, colds, skin disorders and diabetes, internally and as a poultice or bath soak.
Doses (Moore, via a secondary site): Cold infusion, 1 to 3 ounces up to three times a day; tincture, 10 to 40 drops up to three times a day. None of this has been tested in people.

Avoid in pregnancy or confirmed heart disease. People with diabetes should use it only under supervision, as medication doses may need adjusting. Large doses are emetic and purgative (causing vomiting and loose stools). The berries are poisonous, and its safety hasn't been fully evaluated.
Other safety measures may be appropriate for you. Always consult a physician.

There are no human trials, so nothing here shows that a tincture or tea works. The evidence is lab work on isolated compounds.

In a 2014 study, researchers extracted dried root bark with methanol and isolated six polyynes (plant compounds built around carbon–carbon triple bonds). The most potent, falcarindiol, cut the viability of breast, lung and liver cancer cells in a dish by half at roughly 5 to 23 micromolar (the IC50). The more potent compounds were also more toxic to normal liver cells. This was in vitro, with isolated compounds, not an herbal preparation. Huang et al., Molecules 2014

A 2018 review found no human clinical trials. A separate 2017 study found stronger antioxidant activity in the leaf than in root or stem, but that's a different part.

Olive is a gnarled Mediterranean evergreen with leathery, narrow leaves, gray-green above and silvery underneath. Northern Hemisphere green olives are picked from late September to about mid-November and black olives into late January, and the leaves come off as a by-product of harvest and pruning.

That doesn’t mean it’s useless, though. This herb is packed with active compounds that make it a desirable addition to the apothecary.

Self-Harvest: Olive is outdoors in USDA zones 8 to 10, with a few cultivars listed for zone 7; colder gardens need a container and winter protection.
Buy It: Starwest Botanicals sells organic cut-and-sifted leaf and an organic powder, both from Tunisia, plus an organic 1:1 extract of dried leaf in 30% alcohol. That's a tincture-style extract, not the standardized extract used in clinical trials. Mountain Rose Herbs carries organic leaf from Turkey and Tunisia (the listing doesn't say cut and sifted), an organic powder, and a 1:3 fresh-leaf extract in 60 to 70% alcohol.
Grow Your Own: Plant Delights Nursery sells 'Arbequina' as a live plant in a 3.5-inch pot, listed for zones 7b to 10b. In a Madrid frost trial, 'Arbequina' and 'Cornicabra' were the most frost-tolerant.

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Don't read the October leaf supply as "pick now for best potency." In the one seasonal study (six cultivars, Croatia and Italy), oleuropein, the main bitter compound in olive leaf, was lowest in October for most cultivars and highest in March, at swollen buds. I couldn't verify visual harvest cues or a best leaf age. Study

Dry: in lab extractions (not tea), room-temperature air-drying gave far more oleuropein than freeze-drying. For tea, tasters in a 2026 study preferred leaf air-dried at 50°C for 3 hours over microwaved leaf, which was more bitter. I found no sourced storage guidance.
Tea: sources give different recipes, and none is standard. Michigan Medicine: 1 tsp (5 g) dried leaf in 1 cup hot water, steeped 10 to 15 minutes. The European Medicines Agency (EMA): a decoction of 5 g dried leaf in 150 mL, twice daily, for up to 2 to 4 weeks.
Tincture: no sourced home ratio. Commercial extracts contain 6 to 15% oleuropein, with no standard amount.

Mild water retention (EMA traditional use): Adults only, after a doctor has ruled out serious causes.
Other traditional uses: Fevers, wounds, rashes and boils, which studies may not support.
Doses: The blood pressure trial below used a standardized extract (EFLA 943), 500 mg twice daily. Tea quantities can't be compared with that.

Pregnancy and breastfeeding safety hasn't been established. Memorial Sloan Kettering lists blood pressure and blood sugar medicines under "do not take if" (lab work showed added lowering; clinical relevance undetermined). EMA flags that oleuropein blocks several cytochrome P450 enzymes (liver enzymes that process many drugs). Olive pollen allergy can be severe. Avoid it where reduced fluid intake is advised, such as severe heart or kidney disease. It may irritate the stomach, so take it with meals. Use caution with liver disease; not recommended under 18.
Other safety measures may be appropriate for you. Always consult a physician.

The summary: small trials on standardized extracts, reviews that disagree, and a tea trial with no benefit. I wouldn't tell anyone olive leaf "lowers blood pressure."

A 2011 trial in Jakarta compared the standardized extract with captopril, a standard blood pressure drug, in stage-1 hypertension (double-blind, 8 weeks). Systolic pressure fell 11.5 mmHg on olive and 13.7 on captopril; the groups weren't significantly different. I read only the abstract. Susalit et al.

The only tea trial I found (Portugal, 2023) gave 13 healthy adults leaf tea with a high-carbohydrate breakfast. Blood glucose was higher overall on olive tea than on placebo, so a single dose didn't help. Meireles et al.

Meta-analyses (pooled reviews of extracts, not tea) disagree. A 2025 review of 3 trials found systolic pressure down about 6 mmHg (Lachovicz); a 2021 review of 5 trials rated certainty low (Ismail); a 2026 review of 11 trials found no significant glucose or lipid effects (Menezes).

Mulch the cranberries. Pine boughs protect the vines from winter drying.

Containers need a plan. Decide where a potted olive will winter before a hard freeze.

If you pick up a bag of fresh cranberries this week, freeze a few. They go straight from freezer to recipe with no thawing. Come share what you're working on in Growing and Harvesting Medicinal Herbs & Teas.

See you in the group!

—Dana

About the editor: Dana is an herbalist, forager and grower who puts plants first for her family's health. She enjoys teaching and learning — and is always up for a conversation about plants of all kinds. Dana also owns the Facebook community: Growing and Harvesting Medicinal Herbs & Teas.