If you want monarch butterflies in your San Leandro garden, milkweed plants are non-negotiable. Milkweed is the only plant monarch caterpillars eat, and without it nearby, adult monarchs have nowhere to lay their eggs.

Here's the short version: plant native milkweed like Narrow Leaf Milkweed or Showy Milkweed, skip tropical milkweed, and pair it with nectar-rich flowers so adult monarchs have food too. San Leandro sits close to important monarch overwintering sites, which makes local gardens especially valuable habitat.

This guide covers which milkweed plant works best here, how to plant and care for it, other monarch plants worth adding, and local ways to get more involved.

Why Milkweed Plants Matter for Monarch Butterflies

Monarch caterpillars eat almost nothing but milkweed. Female monarchs search out milkweed specifically to lay their eggs, and without it in range, they simply can't reproduce. That makes milkweed plants the single most important addition you can make if you want monarchs in your yard.

Western monarch populations overwinter along California's coast, including in the eucalyptus grove at San Leandro's Monarch Bay Golf Course. Gardens throughout the East Bay act as stepping stones and breeding grounds for monarchs moving to and from these overwintering sites, so even a small milkweed patch contributes to the bigger picture.

Choosing the Right Milkweed Plant for Your Garden

Not all milkweed is created equal, and the type you choose matters. Locally, two native species work best:

•        Narrow Leaf Milkweed (Asclepias fascicularis): a California native with slender leaves and clusters of small white and purple flowers, well suited to East Bay gardens.

•        Showy Milkweed (Asclepias speciosa): a taller native species with large pink blooms, also well adapted to our climate.

Avoid Tropical Milkweed (Asclepias curassavica). It's widely sold but doesn't die back in winter here the way native milkweed does, which can disrupt monarch migration patterns and allow parasite buildup. Stick with native milkweed species whenever you can find them, sourced from a nursery that carries California native plants.

How to Plant and Care for Milkweed in the East Bay

Milkweed plants prefer full sun and well-drained soil. Once established, native milkweed is quite drought tolerant, which fits well with East Bay water restrictions.

Plant in spring or fall, spacing plants roughly 18 to 24 inches apart to give roots room to spread. Water regularly the first season while roots establish, then cut back significantly once the plant is mature. Don't be alarmed if your milkweed looks stripped bare in late summer, that's caterpillars doing their job. The plant typically regrows.

Skip pesticides entirely in and around your milkweed. Even organic pest sprays can harm monarch eggs and caterpillars, undoing the whole point of planting it.

Other Monarch Plants to Pair with Milkweed

Milkweed feeds caterpillars, but adult monarchs need nectar from a variety of blooming plants throughout the season. Pairing milkweed with other California native flowers extends food availability and makes your garden more resilient overall. Good companion choices include native perennials that bloom at different times of year, giving monarchs a reliable nectar source from spring through fall. Our nursery's plants that attract pollinators is a good place to start building out a fuller monarch garden.

Local Ways to Get Involved

San Leandro has an active community built around monarch conservation. The San Leandro Butterfly Garden, located across from the BART station, relies on volunteers who help maintain its native plant habitat on the first Saturday of each month from 10am to noon.

Homegrown Habitats San Leandro (HHSL) is a local group focused on native plant gardening for biodiversity, partnering with the city on demonstration gardens and community events. Joining their mailing list is a good way to hear about upcoming plantings, talks, and volunteer days.

If you want to see where local monarchs spend the winter, the Xerces Society maintains a digital map of overwintering sites across the region, along with guidance on visiting responsibly without disturbing dormant butterflies.

Ready to Start Your Monarch Garden?

Evergreen Nursery carries California native milkweed and other pollinator-friendly plants right here in San Leandro. Building a small patch of native milkweed today gives monarchs a place to lay eggs this season, and it's one of the simplest ways any East Bay gardener can support their recovery.

Stop by our garden center, or reach out through our contact page if you have questions before you visit.

Read More: Monarchs and Milkweed in Your San Leandro Garden

Frequently Asked Questions

Q: What is the best milkweed plant for a San Leandro garden?

Narrow Leaf Milkweed (Asclepias fascicularis) and Showy Milkweed (Asclepias speciosa) are the two native species that do best locally. Both are California natives adapted to our climate and support monarch caterpillars without the downsides of tropical varieties.

Q: Why should I avoid tropical milkweed?

Tropical milkweed doesn't die back in winter the way native milkweed does in California. That can encourage monarchs to breed year-round instead of migrating, and lets a parasite called OE build up on the plant, which can harm butterfly populations.

Q: When should I plant milkweed?

Spring and fall are the best planting windows in the East Bay. Give new plants regular water through their first season, then scale back once they're established, since mature native milkweed is fairly drought tolerant.

Q: Do monarch plants need pesticides?

No, and you should avoid them. Milkweed's whole purpose is hosting monarch eggs and caterpillars, and even organic pesticides can kill them along with other beneficial insects. Let caterpillars eat the leaves; the plant typically bounces back.

Q: What other plants help monarch butterflies besides milkweed?

Adult monarchs need nectar, not just milkweed leaves. Pairing milkweed with a variety of blooming California native perennials gives them food throughout the season and makes your garden more useful to pollinators generally.

Q: Where do local monarchs spend the winter?

Western monarchs overwinter along the California coast, including in the eucalyptus grove at San Leandro's Monarch Bay Golf Course. The Xerces Society maintains a map of regional overwintering sites if you want to see one in person.

Spring may be the textbook season for planting, but summer doesn't have to be off-limits for starting your backyard fruit trees. Container-grown trees can go into the ground any month of the year; the difference in summer is that they need a more attentive owner. Heat, low humidity, and intense sun put extra pressure on a tree whose roots are still settling in. With the right site, the right soil prep, and a watering routine you actually stick to, a summer-planted tree can establish just as well as a spring one.

This guide walks East Bay gardeners, from Oakland and Alameda to Hayward, San Leandro, and Castro Valley, through everything needed to get a new fruit tree (including backyard citrus trees) through its first hot season and into a healthy fall.

Why Summer Planting Is Different

A tree growing in a 5- or 15-gallon nursery pot can be transplanted at any time because its root system stays largely intact during the move. Bare-root trees, by contrast, really only belong in the ground in winter while dormant.

The catch with summer planting is timing: the tree is pulling water through its leaves and growing actively at the exact moment its roots are recovering from being disturbed. That's a vulnerable combination.

The East Bay's microclimates work in your favor here. Coastal fog and afternoon marine air keep places like Alameda, Oakland, and San Leandro noticeably milder than inland pockets such as Castro Valley and Hayward, which can run several degrees hotter on the same afternoon. Know which side of that line your yard falls on, because it changes how often you'll need to water.

Choosing the Right Spot

Sunlight. Fruit trees are sun-hungry. Aim for 6 to 8 hours of direct sun daily, and lean toward 8 to 10 hours for Mediterranean fruits like figs and pomegranates. A south- or west-facing spot that holds afternoon warmth tends to produce better peaches, nectarines, and apricots. Avoid planting near anything that will eventually shade the tree, even a couple of lost sun hours a day adds up to a real drop in fruit production.

Drainage. This is the one step you cannot skip. Poor drainage drowns roots quietly, often before any above-ground symptoms appear. Test it yourself: dig a hole about a foot deep, fill it with water, let it drain, then fill it again and time the second drain. If water is still standing after three or four hours, you have a drainage problem. Your options are to plant elsewhere, build a raised mound at least 6 to 12 inches high and 3 feet wide, or install a French drain. Don't try to fix bad drainage by amending just the hole, a fluffy pocket of soil surrounded by dense clay still traps water like a bowl.

Spacing. A single full-size tree typically needs 15 to 20 feet of room. For smaller East Bay lots, many gardeners plant several semi-dwarf varieties closer together and control their size with regular summer pruning, which packs more variety and a longer harvest season into a small footprint.

Preparing the Soil

East Bay soils range from the heavy clay common in the Oakland hills and Castro Valley to the denser, compacted ground found in parts of San Leandro and Hayward, with lighter, sandier pockets in some Alameda neighborhoods.

The rule of thumb: don't over-amend the hole itself. Instead, blend your native soil with coarse material, perlite, pumice, vermiculite, or scoria, at a minimum of 20% by volume for decent soil, and more than that for heavy clay. Skip bark or wood chips as a drainage amendment. Sandy soils benefit from the opposite adjustment: mix in organic matter like compost or coco coir to help the root zone hold moisture through the dry months. Whatever you do, leave fertilizer out of the planting hole, it can scorch new roots before they've had a chance to grow.

Planting Step by Step

1. Dig a hole at least twice as wide as the root ball.

2. Mix the excavated soil with at least 20% coarse aggregate.

3. Add roughly 6 inches of that mix to the bottom of the hole.

4. Slide the tree out of its container gently, disturbing the roots as little as possible, and loosen any circling roots if the tree is root-bound.

5. Set the tree in the hole and check that the top of the root ball sits level with, or slightly above, the surrounding soil.

6. Backfill around the edges, tamping gently to remove air pockets, don't pack it hard.

7. Keep the trunk's flare (the crown) above the soil line; burying it invites rot.

8. Water deeply right away to settle everything in.

9. Mulch immediately.

A slow, deep soak after planting does more good than a quick spray. Hold off on watering again until the top inch or two of soil has dried out.

Mulch: The Most Underrated Summer Tool

A 3- to 4-inch layer of organic mulch, wood chips, shredded bark, or straw, does three jobs at once: it keeps roots cooler, slows moisture loss, and slowly enriches the soil as it breaks down. Spread it in a wide ring out toward the edge of the canopy, but keep it 4 to 6 inches clear of the trunk itself. Piling mulch against the bark traps moisture and invites rot, think donut, not volcano. Expect to top it off again by late summer as it compresses and thins out.

Watering Through the Heat

Getting watering right matters more than almost anything else for a summer-planted tree. The target is soil that feels like a damp sponge, never bone dry, never soggy.

Deep, infrequent watering beats frequent shallow sprinkling, since it trains roots to grow downward rather than staying near the surface. Skip overhead sprinkling from a hose, which can encourage disease.

For the first eight weeks, plan on watering two to three times a week, checking soil moisture first with a finger or wooden dowel pushed 3 to 4 inches deep, both near the drip line and in the root ball itself, since a long-potted tree's root ball can stay dry even when the surrounding soil is wet. Once you see active new growth, you can taper to once or twice weekly, but don't assume the tree can fend for itself after that, most backyard fruit trees, citrus included, need supplemental water through the entire dry season. When temperatures climb past 90°F in hotter inland spots, increase frequency; young trees can wilt within hours during a heat spike.

Read More: How to Care for New Fruit Trees in Summer: A Practical Guide for SF East Bay Gardeners

Protecting Against Heat Stress

Young trees, especially peaches, nectarines, and cherries, have thin bark that's vulnerable to sunburn on the trunk and lower branches. If your yard regularly tops 90°F, consider wrapping the lower trunk or painting it with diluted white latex paint, or rigging temporary shade cloth on the sun-exposed side for the first few weeks.

Resist the urge to fertilize during the first summer. All of the tree's energy should go toward building roots, not pushing new leaf growth the root system can't yet support. Save fertilizing for the following spring.

Pests and Diseases to Watch For

A few East Bay regulars to keep an eye on: peach leaf curl (treated with a dormant-season copper spray, not a summer fix), brown rot on stone fruit (prevented by removing mummified fruit and improving airflow), codling moth in apples and pears (managed with pheromone traps, kaolin clay, or timed spinosad sprays), spider mites in hot dry weather (often knocked back with a strong hose spray), scale insects, spotted wing drosophila on thin-skinned fruit like cherries and figs, aphids on new growth, and fire blight on apples and pears. Most of these respond well to an integrated approach: monitor first, intervene only when needed, and reach for the least disruptive treatment. If you're not sure what you're looking at, a photo or sample can usually get you a quick diagnosis from your local nursery.

Pruning and Fruit Thinning

Leave a first-summer tree alone except to remove dead, broken, or crossing wood. From the second year on, light summer pruning is an effective way to keep a tree's size manageable without triggering the aggressive regrowth that winter pruning can cause, useful for anyone trying to fit several trees into a small backyard.

It's also worth thinning, or even removing, fruit from a young tree in its first year or two. Letting a small tree carry a full crop pulls energy away from root and structure development; a little patience now means better harvests later.

Looking Ahead to Fall

Cooler fall temperatures are when root growth really picks up, so keep watering until the rains settle in, typically late November or December locally. As the season turns, add a layer of compost and fresh mulch, clear away any leftover fruit that could harbor pests over winter, and mark your calendar for a round of dormant-season spraying to get ahead of next year's pests and diseases.

With consistent watering, a well-mulched root zone, and a bit of patience through the heat, a summer-planted tree, fruit or backyard citrus alike, can settle in just as successfully as one planted in spring, and reward you with years of harvests to come.