# The Morton Arboretum

The Morton Arboretum is a Foundation based in Lisle, United States.

## Overview

- **Organization type:** Foundation
- **Headquarters:** Lisle, United States
- **Region:** North America
- **Address:** 4100 Illinois Route 53, Lisle, IL 60532, United States
- **Founded:** 1922
- **Assets under management:** Undisclosed
- **Website:** mortonarb.org
- **LinkedIn:** linkedin.com/company/the-morton-arboretum

## Regulatory record

- **Reports private funds:** No

## About

Joy Morton established The Morton Arboretum in 1922 on his 178-acre Lisle estate, funded by the fortune he generated as founder of Morton Salt Company. The institution has since grown to 1,700 acres and stewards a collection of more than 200,000 live plants, including 4,500 tree species. Morton structured the endowment to permanently fund botanical research, public education, and tree conservation — a mission distinct from the grantmaking foundations more typical of industrial fortunes. Investment management for the endowment pursues a generalist strategy across public equities, fixed income, private equity, real assets, and hedge funds — designed to fund operations, scientific staff, and the $10–15 million annual operating budget implied by the institution's scale and staffing. The portfolio draws private-market exposure and income-producing assets calibrated against the Arboretum's long-duration liabilities — a perpetuity institution with a living collection that requires multi-decade capital planning. The campus itself represents the most significant real asset, including the Sterling Morton Library, Leask Lane Estate, and seasonal exhibits. The Board of Trustees includes commercial horticulture operators Robert A. Bartlett Jr. of Bartlett Tree Experts and Anna Caroline Ball of Ball Horticultural Company — governance that bridges botanical science with operating businesses. The Arboretum partners through ArbNet, Botanic Gardens Conservation International, and the American Public Gardens Association — not as investment co-participants, but as conservation collaborators coordinating global tree-preservation initiatives across 100+ countries. The endowment's structural profile is that of a mission-driven evergreen pool — no donor-advised funds, no spending-rule politics typical of private foundations, and no alumni pressure seen in university endowments. The perpetuity mandate is physically embedded in the collection itself: every capital decision must preserve the 1,700-acre campus and its century-old trees, making this less a financial portfolio and more a biological trust funded by public markets.

## Sectors

- Real Estate
- Education

## People

- Joy Morton — Founder
- Robert J. Schillerstrom — Chair of the Board of Trustees
- Anna Caroline Ball — Vice Chair of the Board of Trustees; CEO of Ball Horticultural Company
- Robert A. Bartlett Jr. — Trustee; Chairman of Bartlett Tree Experts

## Questions

### What investment strategy does the endowment follow?

The Morton Arboretum employs a generalist endowment model with allocations across public equities, fixed income, private equity, real assets, and hedge funds — the standard diversification playbook for perpetual-horizon institutions. The portfolio must balance liquidity demands for campus operations with long-term return targets that fund scientific staff and tree conservation. Exact allocation percentages and performance figures are not disclosed publicly.

### How is The Morton Arboretum related to Morton Salt?

Joy Morton founded Morton Salt Company in 1886 and used his personal wealth to establish the Arboretum in 1922 on his Lisle estate. Morton Salt was sold through multiple corporate transactions over decades — most recently held by Stone Canyon Industries (since 2021) — and no ongoing ownership connection exists between the salt business and the Arboretum. The Arboretum functions as an independent 501(c)(3) supported by its endowment, admissions, memberships, and philanthropy.

### What role do the operating businesses of trustees play in endowment management?

Trustees Robert A. Bartlett Jr. (Bartlett Tree Experts) and Anna Caroline Ball (Ball Horticultural Company) bring commercial horticulture expertise to the board, not capital or investment mandates. Their operating insights inform stewardship of the Arboretum's living collection and business strategy, but the endowment's financial management follows standard institutional governance — no co-investment vehicles or side arrangements involving trustee companies are disclosed in public records.

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Last updated: 2026-06-03T20:00:00.000Z

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